underpin vs hold up

underpin and hold up both are verbs.

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

As verbs, hold up is a hypernym of underpin; that is, hold up is a word with a broader meaning than underpin:

Other hypernyms of underpin include hold, support, sustain.

underpin (verb)	hold up (verb)
support from beneath	cause to be slowed down or delayed
support with evidence or authority or make more certain or confirm	be the physical support of; carry the weight of
	hold up something as an example; hold up one's achievements for admiration
	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