sign of the cross

a Christian sign made in blessing or prayer by tracing a cross from the forehead to the chest and to each shoulder, or in the air

［表示祝福或祈祷］画十字

sign of the times

something judged to exemplify or indicate the nature or quality of a particular period, typically something unwelcome or unpleasant

时代的标志（尤指不受欢迎或讨厌的事物）

the theft was a sign of the times.

偷窃是这个时代的标志。

signed, sealed, and delivered (或 signed and sealed

formally and officially agreed and in effect

正式签署生效

sign something away/over

officially relinquish rights or property by signing a deed

（在契约上）签字放弃（权利，财产）

I have no intention of signing away my inheritance.

我无意签字放弃继承权。

sign for

sign a receipt to confirm that one has received (something delivered or handed over)

签收

sign someone in

record someone's arrival in a register

签到登记

sign someone off

record that someone is entitled to miss work, typically because of illness

登记某人（尤指因病）不宜工作

sign off on

(US informal)assent or give one's approval to

(美，非正式)认可，同意

it was hard to get celebrities to sign off on those issues.

很难得到名流对这些问题的认同。

sign someone on

take someone into one's employment

签约雇佣

sign someone out

authorize someone's release or record their departure by signing a register

签字放行；登记某人的离开

sign something out

sign to indicate that one has borrowed or hired something

登记某物借出（或租用）

I signed out the keys.

我登记将钥匙借出。

sign someone up

(formally)engage someone in employment

(正式)雇佣

sign in

To record the arrival of (another or oneself) by signing a register.

签到：通过在签名记录（另一个人或者是自己的）到达

sign off

To announce the end of a communication; conclude.

宣布广播结束；结束

To stop transmission after identifying the broadcasting station.

在说完广播电台台名之后停止播送

&I{Informal} To express approval formally or conclusively

【非正式用语】 正式同意：正式或结论性地表示同意

got the Congress to sign off on the tax proposal.

使国会正式同意这项税务提案