1.
to betray, to turn traitor
To act disloyally to someone who trusts you.
友達を裏切った。
I betrayed my friend.
信頼を裏切らないで。
Don't betray my trust.
彼は仲間を裏切って逃げた。
He betrayed his companions and ran away.
2.
to disappoint, to let down
To fail to meet expectations.
期待を裏切る結果だった。
The result was disappointing.
Lit: a result that betrayed expectations
彼女の演技は良い意味で期待を裏切った。
Her performance exceeded expectations in a good way.
期待を裏切る can also be used positively
この映画は期待を裏切らなかった。
This movie didn't disappoint.
裏切る means to betray or to disappoint expectations.
COMPONENTS:
- 裏: back, behind
- 切る: to cut
Literally suggests "cutting from behind" or stabbing in the back.
TRANSITIVITY:
- Type: 他動詞 (transitive)
- Pattern: 〜を裏切る
COMMON PATTERNS:
- 友人を裏切る: to betray a friend
- 信頼を裏切る: to betray trust
- 期待を裏切る: to betray/disappoint expectations
- 約束を裏切る: to break a promise
RELATED WORDS:
- 裏切り: betrayal (noun)
- 裏切り者: traitor