|1.||big kid pants|
What a lot of people need to put on.
"Put on your big kid/girl/boy pants" means that the person who is being referred to is being immature and childish and won't man up.
"Matt challenged Jim to a fight for insulting his mother."
"I heard he wasn't going to show."
"Really? Jim needs to put on his big kid pants and take responsibility for his stupid actions."