寝返ねがえ
negaeri

Noun
Suru Verb

1. turning over in bed; rolling over; tossing and turning

Intransitive
Related to 寝返りを打つ
彼女かのじょがベッドで寝返ねがえりばかりうっている。
kanojoga beddode negaeribakari utte iru.
She is tossing and turning in bed.
Noun
Suru Verb

2. betrayal; double-crossing

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.