Proverbs 25:18 New English Translation

¹⁸Like a club or a sword or a sharp arrow,^[a]
so is the one who testifies against^[b] his neighbor as a false witness.^[c]

Proverbs 25:18 sn The first line identifies the emblem of the proverb: False witnesses are here compared to deadly weapons because they can cause the death of innocent people (e.g., Exod 20:16; Deut 5:20; Prov 14:5).
Proverbs 25:18 tn The verb עָנָה (ʿanah) followed by the preposition ב (bet) with its object means “to testify against” (answer against someone). With the preposition ל (lamed) it would mean “to testify for” someone. Here the false witness is an adversary, hence the comparison with deadly weapons.
Proverbs 25:18 tn While עֵד (ʿed) could be interpreted as “evidence” (a meaning that came from a metonymy—what the witness gives in court), its normal meaning is “witness.” Here it would function as an adverbial accusative, specifying how he would answer in court.

New English Translation (NET)