sustain vs crock up

sustain and crock up both are verbs.

Word	Noun	Adjective	Verb	Adverb
sustain	No	No	Yes	No
crock up	No	No	Yes	No

As verbs, crock up is a hyponym of sustain; that is, crock up is a word with a more specific, narrower meaning than sustain:

Other hyponyms of sustain include break down, collapse, cramp, break up, collapse, crack, crack up, stress.

sustain (verb)	crock up (verb)
undergo (as of injuries and illnesses)	suffer a nervous breakdown
establish or strengthen as with new evidence or facts
admit as valid
supply with necessities and support
provide with nourishment
be the physical support of; carry the weight of
lengthen or extend in duration or space