寝返る

Meaning

1. v5rvi
   to change sides; to double-cross; to betray
2. v5rvi
   to roll over (in bed); to turn over

Example sentences

• こいつ、さっきまで俺の相棒だったのに、もう寝返りやがった。

  This rat, up until just now he was my partner and now he's gone and turned on me.