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deter

/dɪˈtɜːr//dɪˈtɜː/·verb
to discourage someone from acting by instilling doubt or fear of consequences
Fig. 1 — A barrier stands in the middle of an empty field with the settled confidence of something that has never once had to prove itself.
01Definition

To deter is to stop an action before it starts — not by force, but by making the cost look too high. The Latin deterrere means 'to frighten off'. High walls, harsh penalties, and a single cautionary tale all deter; what they have in common is that they work on the mind, not the body. A deterrent succeeds only if it is believed: what deters does not push you away so much as quietly persuade you not to come.

02In use
  • iSteep fines are meant to deter drivers from speeding.
  • iiThe harsh climb did not deter them; if anything it seemed to galvanize the group.
  • iiiA few bad experiences were enough to deter her from investing again.
03Collocations
  • deter crime
  • act as a deterrent
  • deter would-be offenders
  • do little to deter

Family deterrent (noun) · deterrence (noun)

04Relations

=discourage, dissuade, impede, inhibit, put off

≠encourage, galvanize, motivate, convince

06TOEFL & IELTS

Frequent in IELTS Writing Task 2 on crime and policy — 'harsher penalties deter offenders' is a ready-made argument, and 'a deterrent' is the noun you want. TOEFL passages use it for animal defenses and strategy ('nuclear deterrence'). Watch the preposition: deter someone *from* doing something. Don't confuse it with 'detain' or 'deteriorate'.

07Asked
What is the difference between deterrent and deterrence?
Deterrence is the strategy or effect — the general principle of stopping actions by threat ('nuclear deterrence'). A deterrent is a specific thing that does it — a fence, a fine, a guard dog. Deterrence is the policy; a deterrent is the tool. The scene above is a deterrent (the barrier) achieving deterrence (an empty field) without ever acting.
Is it 'deter someone from doing something'?
Yes — the fixed pattern is deter someone FROM doing something: 'high fees deter students from applying'. The from is not optional, and the verb after it takes the -ing form, never the infinitive. No other preposition works: not 'deter to do', not 'deter against'.
What is a deterrent?
Anything that discourages an action by making it seem too costly or risky — a penalty, an obstacle, a visible consequence. Its power is entirely psychological: a deterrent works only while it is believed, and the moment people call the bluff it stops deterring. It never needs to act; it only needs to be credible.
What does 'nuclear deterrence' mean?
The Cold War doctrine that no side will attack because the other could retaliate devastatingly — safety bought by mutual threat rather than by defence. It is deterrence at its purest and most fragile: it prevents the very thing it is armed for, and holds only as long as the threat stays believable on every side.
Where does deter come from?
From Latin deterrere, 'to frighten off' — the terr- is the same fear-root as terror and terrify. That origin is the whole mechanism: a deterrent works on the mind through fear of consequences, not on the body through force. It scares you off before you start, which is exactly what the barrier in the scene above does.
What is the opposite of deter?
Encourage — and in stronger contexts, incite or provoke, which actively push toward an action deter pushes away from. Note that deter's own family has no positive twin: there is no 'incentivrent' to balance a deterrent, so English reaches for incentive instead when it wants the encouraging force.