Third-person singular present tense of disqualify; causes someone or something to be declared ineligible.
From disqualify (verb) + -s (third-person singular marker). Disqualify came into English in the 1600s from dis- + qualify.
The verb disqualify is relatively recent in English—earlier people might have said 'render unqualified' or 'bar from competing,' showing how -dis + qualified became a simpler, stronger way to express removal from eligibility.
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