离开学校英语（离开学校英语证书能考哪些）

榆树网

A:back out 榆树网

withdraw from a commitment. to decide not to do something that you had said you would do:

"if he backs out of the deal they'll sue him"

You agreed to come. You can't back out now!

They backed out of the deal the day before they were due to sign the contract

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