| 词汇 | back out (of sth) |
| 释义 | ☞ back back out (of sth) to decide not to do sth that you had promised to do 决定不守诺言；食言；背信: ◇you promised you would come with me. you can't back out of it now! 你答应跟我一起来，现在可不能食言！ |
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