Dictionary definition · stand up
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"
- resist or withstand wear, criticism, etc."Her shoes won't hold up"
- rise up as in fear"The dog's fur bristled"
Source: Open English WordNet (CC BY 4.0).