1.
key
A metal instrument for opening a lock.
鍵を忘れた。
I forgot my key.
鍵をかけてから出かけた。
I locked up before going out.
鍵をなくして家に入れなくなった。
I lost my key and couldn't get into my house.
2.
key, clue
Something crucial for solving a problem.
成功の鍵は努力だ。
The key to success is effort.
問題を解く鍵を見つけた。
I found the key to solving the problem.
この事件の鍵を握っているのは、あの証人だと思う。
I think that witness holds the key to this case.
COMMON EXPRESSIONS:
- 鍵をかける: to lock
- 鍵を開ける: to unlock
- 鍵を閉める: to lock (alternate)
- 鍵を握る: to hold the key (figurative)
COMPOUNDS:
- 合鍵: spare/duplicate key
- 鍵穴: keyhole
- 鍵盤: keyboard (piano)
- 鍵括弧: Japanese quotation marks「」
FIGURATIVE USE:
成功の鍵 (the key to success) demonstrates how 鍵 is used metaphorically for something crucial or decisive, similar to English "key."