hold up vs detain

hold up and detain both are verbs.

Word	Noun	Adjective	Verb	Adverb
hold up	No	No	Yes	No
detain	No	No	Yes	No

As verbs, hold up and detain are synonyms defined as:

Other synonyms of hold up include delay.

hold up (verb)	detain (verb)
cause to be slowed down or delayed	cause to be slowed down or delayed
be the physical support of; carry the weight of	stop or halt
hold up something as an example; hold up one's achievements for admiration	deprive of freedom; take into confinement
rob at gunpoint or by means of some other threat
continue to live and avoid dying
resist or withstand wear, criticism, etc.
resist or confront with resistance