גָּעַ֣רְתָּ ג֭וֹיִם אִבַּ֣דְתָּ רָשָׁ֑ע שְׁמָ֥ם מָ֝חִ֗יתָ לְעוֹלָ֥ם וָעֶֽד׃
האָסט אָנגעשריִען אױף די פֿעלקער, האָסט אונטערגעבראַכט דעם רָשע, זײער נאָמען האָסטו אױסגעמעקטאױף אײביק און שטענדיק.
Rashi
You rebuked nations [This alludes to Amalek, described in Num. 24:20 as] “Amalek is the first of the nations.”
Radak
Thou hast rebuked the nations (גוִֹיִם גערת): – (The expression for) rebuke when used without the preposition beth has the meaning of destruction, as: “Rebuke the wild beast of the reed” (Ps. 68:31); and as, “Behold, I will rebuke the seed for your sake” (Mal. 2:3); and so Thou hast rebuked (the) nations here.
Rashi
You erased their name “For I will surely erase the remembrance of Amalek” (Exod. 17:14).