あいぼう
partner; pal; accomplice
Common word Also written 合棒
Noun
彼かれらは私わたしの仕事しごとの相棒あいぼうです。
They're my friends from work.
こいつ、さっきまで俺おれの相棒あいぼうだったのに、もう寝返ねがえりやがった。
This rat, up until just now he was my partner and now he's gone and turned on me.