| 单词 | knuckle down (to sth) |
| 释义 | ● ˌknuckle ˈdown (to sth )(informal ) to begin to work hard at sth 开始努力做SYN get down to◆ I'm going to have to knuckle down to some serious study . 我得开始认认真真地学习了。See also knuckle |
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