make up

phrasal verb
1    [T make sth <-> up] to invent a story or an excuse:
?Ron made up an excuse so his mother wouldn't be mad.
2    [T make up sth] to combine together to form something:
?the rocks and minerals that make up the Earth's outer layer
3    make it up to sb to do something good for someone because you feel responsible for something bad that happened to them(补偿):
?I'm sorry I forgot your birthday! I promise I'll make it up to you.
4    [I] to become friends with someone again, after an argument --see also make up your mind (MIND1)