Decide

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late Middle English (in the sense ‘bring to a settlement’): from French décider, from Latin decidere ‘determine’, from de- ‘off’ + caedere ‘cut’.

wiktionary

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From Middle English deciden, from Old French decider, from Latin dēcīdere, infinitive of dēcīdō(“cut off, decide”), from dē(“down from”) + caedō(“cut”).

etymonline

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decide (v.)

late 14c., "to settle a dispute, determine a controversy," from Old French decider, from Latin decidere "to decide, determine," literally "to cut off," from de "off" (see de-) + caedere "to cut" (from PIE root *kae-id- "to strike"). For Latin vowel change, see acquisition. Sense is of resolving difficulties "at a stroke." Meaning "to make up one's mind" is attested from 1830. Related: Decided; deciding.