Retaliate

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early 17th century: from Latin retaliat- ‘returned in kind’, from the verb retaliare, from re- ‘back’ + talis ‘such’.

wiktionary

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From Latin retaliātus, past participle of retaliō(“to requite, retaliate”), from re-(“back, again”) + talis(“such”).

etymonline

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retaliate (v.)

"requite, repay, or return in kind," 1610s, from Latin retaliatus, past participle of retaliare "pay back in kind," from re- "back" (see re-) + Latin talio "exaction of payment in kind," from or influenced by talis "suchlike" (see that). Originally of kindness, civility, etc., but by 1630s of injury, ill-treatment, etc. (now the usual sense). Intransitive sense is from 1650s. Related: Retaliated; retaliating.