いてまう

Meanings

1

godan verb (-u), transitive verb

Kansai dialect verb meaning to physically beat someone, harm them, or defeat them thoroughly. Rough, colloquial tone.

あい

で

絶ぜっ

対たい

に

相あい

手て

を

い

て

まっ

たる

。

I'll definitely crush the opponent in the next match.

やっつける
Standard Japanese verb for beating or defeating someone; いてまう is the rough Kansai dialect equivalent.
ぶっ飛とばす
Also a rough standard Japanese verb for beating someone up, but いてまう is specifically Kansai dialect.

Kansai dialect verb, likely derived from いて (from 射る or 打つ) + まう (Kansai equivalent of しまう), giving a sense of 'to finish off' or 'to do completely'.