back out
US /bæk aʊt/
UK /bæk aʊt/

1.
退出, 反悔
to withdraw from a commitment or agreement
:
•
He promised to help, but then he backed out at the last minute.
他答应帮忙,但最后一刻又退缩了。
•
She decided to back out of the deal because of the high risks involved.
由于涉及高风险,她决定退出这笔交易。