The airline was forced to ____ its flight schedule after fuel prices surged. The options are curtail, curb, stem, and deduct. A learner who knows the first three all mean something like "reduce" can hesitate, because each looks acceptable before "schedule." The intended answer is curtail — to cut something short or reduce it in scope, exactly what happens to a schedule that gets trimmed. This guide sorts the reduction verbs so the choice rests on the kind of thing being held back, not on which verb sounds most businesslike.
Three verbs, one idea of "hold back," different situations
All three describe making something less, but they differ in the image each carries — and Part 5 lives on that difference.
curtail → cut short, reduce in extent or duration ("curtail spending," "curtail a trip")
curb → keep in check, restrain something that could grow ("curb inflation," "curb enthusiasm")
stem → stop or slow a flow, especially a bad one ("stem the tide," "stem losses")
Curtail shortens or shrinks something already in place; curb reins in something that might otherwise expand; stem halts something that is flowing or leaking. Same direction — less — but different pictures.
The one-second test: cut short, hold in check, or stop a flow?
You do not need to weigh nuance first. Read what the object is doing:
- The object is an activity, budget, or schedule being trimmed or shortened → curtail.
- The object is a tendency, appetite, or rising figure being kept from growing → curb.
- The object is a flow, spread, or steady loss being stopped → stem.
The government introduced measures to ____ rising house prices. Prices are a rising figure being held in check, so the answer is curb, not curtail. Emergency funding was released to ____ the outflow of deposits. An outflow is a flow being stopped, so stem fits. Read the object and its motion, and the verb decides before any question of formality arises. For the wider skill of reading whether an item tests meaning at all, see word choice versus word form.
Curtail versus curb: the overlap that costs points
The two blur with budgets and activities, because both can mean "reduce." The split is real: curtail cuts something back to a smaller size, while curb stops something from getting bigger.
The firm had to **curtail** its expansion plans.✓ — scale back what was planned.The firm introduced rules to **curb** overspending.✓ — prevent spending from rising.
When the object already exists and is being trimmed (a schedule, a trip, freedoms, services), curtail fits. When the object is a tendency or figure that could climb and is being reined in (inflation, emissions, enthusiasm, corruption), curb fits. TOEIC exploits this by offering both and letting the object's direction — shrinking versus being held down — tip the answer.
Why "stem" is the flow word, not the budget word
Stem is the distractor that punishes reading "reduce" without checking for movement. It pictures stopping something that flows: a tide, a leak, a stream of losses:
Nothing could **stem** the tide of resignations.✓ — halt a flow of people leaving.The bank cut rates to **stem** the loss of customers.✓ — stop a steady outflow.
Put stem next to "spending" and it reads oddly unless the spending is framed as a flow ("stem the drain on reserves"). The verb tracks the image of a current being blocked. Matching the verb to the picture the sentence paints — rather than defaulting to the fanciest option — is the same instinct that separates a stringent standard from a strict rule: context, not sophistication, decides.
The confusable trap: deduct is arithmetic, not restraint
Deduct shares the "take away" ring but means to subtract a specific amount, usually money, not to hold an activity back:
The store will **deduct** 10% at checkout.✓ — subtract a figure.The store had to **curtail** its opening hours.✓ — cut an activity short.
Deduct the schedule is nonsense; deduct tax and deduct expenses are idiomatic. When the sentence is about subtracting a quantity from a total, reach for deduct; when it is about reducing the scope of an activity, reach for curtail.
Quick-reference table
| Verb | Core image | Typical objects | Signal in the sentence |
|---|---|---|---|
| curtail | cut short, shrink | spending, schedule, trip, services, freedoms | something in place being trimmed |
| curb | keep in check | inflation, emissions, enthusiasm, corruption | a tendency or figure kept from rising |
| stem | stop a flow | tide, losses, outflow, spread | something flowing or leaking, being halted |
| deduct | subtract an amount | tax, fee, expenses, points | a specific quantity taken from a total |
Practice the decision
The council voted to ____ weekend bus services to save money.→ curtail (trim an existing activity).New taxes are designed to ____ sugar consumption.→ curb (hold a tendency down).The dam was reinforced to ____ the flooding.→ stem (stop a flow).The platform will ____ a small transaction fee from each payment.→ deduct (subtract an amount).
In each case the object and its motion — being trimmed, held down, stopped, or subtracted — decides the verb before any judgment of tone. Lock onto the picture, and this cluster stops being guesswork.
Takeaway
Do not pick these verbs by how formal they sound. Read the object: activities and budgets get curtail, rising tendencies get curb, flows and losses get stem, and specific amounts get deduct. The reduction verbs are sorted by the image the sentence paints, and Part 5 rewards the reader who asks what is being held back before choosing how.