不遵守（诺言、合约等）; 打退堂鼓

ph.

1. He has decided to back out of the scheme.
他决定退出这项计划。

2. He backed out of the deal when he saw the risks.
当他看到有风险的时候，立即退出交易。

1. 收回：正如收回 Balck Scholes 隐含波动一样,投资者可以收回(back out)价外卖权中暴跌的可能性与强度.

2. 食言：back on one's feet 经受打击后重新站起来 | back out 食言 | backseat driver 指手划脚的人

3. 后辅刃：后内环绕,后内螺旋形 back in spiral | 后辅刃 back out | 后内括弧形 back out bracket

4. 食言,打退堂鼓：63. on cloud nine 无比幸福,欣喜若狂 | 64. back out 食言,打退堂鼓 | 65. grin and bear it 逆来顺受

1. 食言；违约；退出
If you back out, you decide not to do something that you previously agreed to do.

e.g. Madonna backed out of the project after much wrangling...
多番争吵之后，麦当娜退出了这个项目。
e.g. Wells was supposed to put up half the money, but later backed out.
韦尔斯本应当出一半的钱，但后来他食言了。

verb

1. make a retreat from an earlier commitment or activity

e.g. We'll have to crawfish out from meeting with him
He backed out of his earlier promise
The aggressive investment company pulled in its horns

Synonym: retreatpull backback awaycrawfishcrawfish outpull in one's hornswithdraw

2. move out of a space backwards

e.g. He backed out of the driveway