What is the meaning of "suck it up"?

The meaning of "suck it up" is:

stop complaining

What is the definition of "suck it up"?

The definition of "suck it up" is:

stop complaining

"suck it up" means

stop complaining

Example Sentences:

A: I hate my job! I hate my boyfriend! I hate my life!
B: Suck it up! At least you have a job!

The teacher told her complaining students to suck it up after they told her the test was too difficult.

From the Blogs:

When it Comes to Iraq: the Left has to Suck it Up


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