くさび
kusabi

Noun

1. wedge; chock; linchpin; lynchpin

Usually Written in Kana
ねじ、てこ、くさび、滑車かっしゃなどは単一たんいつ機械きかいばれる。
neji teko kusabi kasshanadowa tan'itsu kikaito yobareru.
The screw, the lever, the wedge, the pulley, etc. are called simple machines.
Noun

2. tie; bond

Usually Written in Kana
Other forms: