Neutralize

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mid 17th century: from French neutraliser, from medieval Latin neutralizare, from Latin neutralis (see neutral).

wiktionary

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From French neutraliser. Surface etymology is neutral +‎ -ize.

etymonline

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neutralize (v.)

1734, "to render neutral" (in a chemical sense), from French neutraliser (17c.), from neutral (see neutral (adj.)). Meaning "to counterbalance, render inoperative, invalidate" is by 1795; as an underworld euphemism for "to kill (someone)," by 1987. The intransitive sense "remain neutral" is older (1660s) but is now obsolete. Related: Neutralized; neutralizing.