Third-person singular present tense of 'extinct,' meaning to cause something to become extinct or to extinguish it.
Present tense conjugation of 'extinct' (from Latin 'extinguere'). While grammatically possible, this form is non-standard in modern English—'extinguishes' is the current standard form.
Medieval writers would write 'the king extincts the rebellion' or 'darkness extincts the light,' but by Shakespeare's time, English-speakers had already switched to using 'extinguish' for the active verb form!
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