pull up vs straighten up

pull up and straighten up both are verbs.

Word	Noun	Adjective	Verb	Adverb
pull up	No	No	Yes	No
straighten up	No	No	Yes	No

As verbs, pull up and straighten up are synonyms defined as:

Other synonyms of pull up include draw up.

pull up (verb)	straighten up (verb)
remove, usually with some force or effort; also used in an abstract sense	straighten oneself
cause (a vehicle) to stop
come to a halt after driving somewhere
straighten oneself