"Suck it up." = to put up with someone or something Example: Person A: I just hate my boss, what can I do? Person B: Unless you change jobs, you'll just have to suck it up. Person A: I can't understand Maths, I'm hopeless at it. Person B: Unless you get a Maths tutor, you'll just have to suck it up.

suck up to someone = always s do nice things and praise the person in order to win influence by that person suck up to your boss suck up to the authorities It is not a nice thing to do. Oops...suck IT up...that is different! suck it up = put up with all the bad stuff happening around you

You can also say: man up grow some _______ (a couple of words fit here) don't be such a _________ (many, many words fit here)