knuckleknuck•le

vt 用指节敲(或压、碰等)

词组knuckle down

1. (打玻璃弹子时)以手指关节贴地面

2. 开始努力工作

• You'd better knuckle down to work or you'll stay up late. 你最好开始工作吧，不然又要干到很晚。

3. 屈服，让步

• The witness didn't knuckle down to the threats. 证人没有屈服于威吓。

knuckle under 屈服，让步

• The government refused to knuckle under to the terrorists. 政府拒绝向恐怖分子让步。