deterrent
UK: dɪˈterənt | US: dɪˈtɜːrənt
n. something that discourages or prevents a particular action
adj. having the effect of discouraging or preventing an action
The word "deterrent" originates from Latin deterrēre, meaning "to frighten away." The prefix de- implies removal or reversal, while terrēre ("to frighten") is also the root of "terror." Over time, the suffix -ent was added to form a noun describing something that causes discouragement. The modern sense retains this logic—a deterrent actively prevents or dissuades through fear or consequence.
High fines act as a deterrent against illegal parking.
The nuclear arsenal serves as a deterrent to potential aggressors.
His stern expression was a deterrent to further questions.
The threat of punishment is not always an effective deterrent.
Bright warning colors on animals are a natural deterrent to predators.