相棒 あいぼう
aibō

Noun

1. partner; pal; accomplice

こいつ、さっきまで おれ相棒 あいぼうだったのに、もう寝返 ねがえりやがった。
koitsu sakkimade oreno aibōdattanoni mō negaeriyagatta.
This rat, up until just now he was my partner and now he's gone and turned on me.
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