B1
to remove your clothes or someone else's clothes
Dictionary examples:
He tried to undress quickly for the doctor, but his socks were glued on. (0.0)
The magician tried to undress, but his clothes kept reappearing. (0.0)
He tried to undress for the beach but forgot his swimsuit was underneath. (0.0)
She undressed the children and put them to bed. (31.4)