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back up备份；支持；倒车
例：Please back up your files regularly. -
back down退让；放弃（立场）
例：He refused to back down from his opinion. -
back off后退；停止施压
例：The police told the crowd to back off. -
back out退出（协议、承诺等）
例：She backed out of the deal at the last minute. -
back away慢慢后退；悄悄退出
例：He backed away from the dangerous situation. -
back into偶然进入；勉强接受
例：He backed into a new job opportunity. -
back over（驾车）向后碾过
例：Be careful not to back over the curb.