stand up for (someone/something)

to defend or support someone or something.

Sometimes you have to stand up for your rights.

I stood up for him because he had a right to his opinion.

• open up
• open up a can of worms
• open up something
• open your eyes
• open your eyes to
• open your eyes to something
• open your heart
• open your mouth
• operative word
• order of the day
• or else
• other day
• other half
• other side of the coin
• other side of the tracks
• other than
• other things being equal
• out-and-out
• out in left field
• out in the middle of nowhere
• out in the open
• out like a light
• out loud
• out of a clear blue sky
• out of action