为某人提供借口，或为某事出了差错提供解释：指在某人缺席或犯错时，代替其提供借口或解释。
provide an excuse or alibi for someone so as to cover up guilt
... fall flat失败；碰壁；未达到预期效果 cover for掩护 bite the bullet咬紧牙关，忍受痛苦 ...
cover for 代替; 负责或承担（他人的义务或工作）; 掩护..
... courageously ad.英勇地，无畏地 cover for 代替，代...工作 coverage n. 涉及范围(作用距离,覆盖厚度,涂层) ...
... count out 逐个地数，算出；判……失败；不包括 cover for 代理，代替 cover up 掩饰，隐藏 ...
The glass cover for this is jointed in the middle.
这个东西的玻璃盖是用活动接头从中间接起来的。
Review all the notes you need to cover for each course.
复习所有你需要涵盖的每门课的笔记。
Some of the commercial activities were a cover for espionage.
有些商业活动是为间谍活动提供掩护。
Blair said North Korea is using its upcoming space launch as a cover for its intercontinental ballistic missile program.
VOA : standard.2009.03.26
An insurance company has reserves and it has enough reserves to cover them for a certain number of accidents.
保险公司一般都有准备金,准备金的数量一般保持在,刚刚够赔偿一定数量的保单
金融市场课程节选 : 耶鲁公开课
And so, it would be a shame for me not to use them to cover some of these issues.
如果不能请到他们来帮助我教授这些主题,那可就太可惜了
心理学导论课程节选 : 耶鲁公开课
Critics,including the Australian government, say the research argument is a cover for the sale and consumption of whale meat, which is banned under international regulations.
VOA : standard.2010.01.06
Backed by the U.N.account, Israeli troops returned to the border area on Wednesday and continued pruning trees and bushes which could provide cover for terrorists.
VOA : standard.2010.08.04
Some are building political cover for themselves by arranging for meetings with senior Bush Administration officials.
Just as obviously, Sasha Fierce provides cover for someone obsessively protective of her private life.
At least when an employee is absent someone can cover for him or her.
FORBES: What's More Disruptive? A Crashed Computer Or A Sick Employee?