break cover

suddenly leave a place of shelter, especially vegetation, when being hunted or pursued

（被追捕时）突然从藏身处（尤其是丛林中）出来

cover one's back (或 北美

(informal)foresee and avoid the possibility of attack or criticism

(非正式)预见并避免受攻击（批评）

cover a multitude of sins

conceal or gloss over many problems or defects

隐瞒（掩饰）许多问题（缺点）

stucco could cover a multitude of sins, including poor brickwork.

粉刷可以掩饰许多毛病，包括很差的砌砖工作。

cover one's position

purchase securities in order to be able to fulfil a commitment to sell

购买证券为了实现可以出售的承诺

cover one's tracks

conceal evidence of what one has done

隐瞒证据

cover the waterfront

(N. Amer. informal)include a wide range of things; cover every aspect of something

(北美，非正式)涵盖很广；包括事物的各个方面

while half the dishes are Italian, the kitchen covers the waterfront from Greece to Morocco.

尽管一半是意大利菜，炊事人员却来自五湖四海。

from cover to cover

from beginning to end of a book or magazine

从（书或杂志的）第一页到最后一页，从头到尾

under cover of

concealed by

在…掩护下

the yacht made landfall under cover of darkness.

游艇在夜幕的掩护下靠岸了。

under plain cover

in an envelope or parcel without any marks to identify the sender

在未注明发送者的信封（包裹）内

under separate cover

in a separate envelope

在另函（另包）内

cover something up

put something on, over, or around something, especially in order to conceal or disguise it

遮蔽；遮盖；掩盖；掩饰

cover (one's) tracks

To conceal traces so as to elude pursuers.

灭迹：掩盖痕迹以甩掉追踪者

cover (the) ground

To traverse a given distance with satisfying speed.

越过：以令人满意的速度越过指定距离

To deal with or accomplish something in a certain manner

处理，完成：以某种方式处理或完成某事

The history course covered a lot of ground in six weeks.

历史课在六周内涉及很广

take cover

To seek concealment or protection, as from enemy fire.

躲藏：为躲避敌人火力而寻求躲藏或保护