To make someone reluctant or unwilling; to turn someone away from something.
From dis- (cause reversal) + incline (from Latin inclinare, to lean toward). As a verb, dis- + incline means to cause someone to lean *away from* rather than toward something.
This verb is the active form of the feeling: you can *disincline* someone (make them unwilling), whereas you just *have* a disinclination (feel reluctant). It's especially useful when discussing how bad experiences disincline people from trying again—the verb captures active causation, not passive feeling.
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