1.
turning over (in bed)
Rolling from one position to another while sleeping.
寝返りを打つ。
To roll over in bed.
赤ちゃんが寝返りを打った。
The baby rolled over.
寝返りがしやすいベッドが欲しい。
I want a bed that's easy to turn over in.
夜中に何度も寝返りを打って、よく眠れなかった。
I rolled over many times in the middle of the night and couldn't sleep well.
赤ちゃんが初めて寝返りをした時、家族みんなで喜んだ。
When the baby rolled over for the first time, the whole family celebrated.
2.
betrayal; defection
Switching sides or betraying one's allies.
味方が敵に寝返った。
Our ally defected to the enemy.
部下が寝返った。
A subordinate betrayed us.
戦いの途中で大きな軍勢が寝返った。
A large army defected in the middle of the battle.
信頼していた仲間に寝返られて、とても悔しかった。
I was very frustrated when a trusted companion betrayed me.
有利な条件を出されて寝返る者が続出した。
People who defected after being offered favorable terms came one after another.
寝返り has both a literal physical meaning and a figurative meaning of betrayal.
PHYSICAL MEANING:
Rolling over in bed while sleeping. An important developmental milestone for babies (赤ちゃんの寝返り).
FIGURATIVE MEANING:
Betray, defect, switch sides. The image is of "turning over" one's allegiance.
COMMON PATTERNS:
- 寝返りを打つ: to roll over (physical) / to defect (figurative)
- 寝返りができる: able to roll over (baby milestone)
- 敵に寝返る: to defect to the enemy
RELATED WORDS:
- 裏切り: betrayal (more direct/harsh)
- 寝る: to sleep (component verb)
- 返る: to return (component verb)