Stand up has 8 different meanings across 1 category:
Verb
rise to one's feet
"The audience got up and applauded"
refuse to back down; remain solid under criticism or attack
put into an upright position
"Can you stand the bookshelf up?"
be standing; be upright
"We had to stand for the entire performance!"
defend against attack or criticism
"He stood up for his friend"
"She stuck up for the teacher who was accused of harassing the student"
resist or withstand wear, criticism, etc.
"Her shoes won't hold up"
"This theory won't hold water"
rise up as in fear
"The dog's fur bristled"
"It was a sight to make one's hair uprise!"
To rise from a lying or sitting position.