ask for it vs hang on

ask for it and hang on both are verbs.

Word	Noun	Adjective	Verb	Adverb
ask for it	No	No	Yes	No
hang on	No	No	Yes	No

As verbs, hang on is a hypernym of ask for it; that is, hang on is a word with a broader meaning than ask for it:

ask for it: persist with actions or an attitude despite the probability that it will cause trouble
hang on: be persistent, refuse to stop

Other hypernyms of ask for it include hang in, hold on, persevere, persist.

ask for it (verb)	hang on (verb)
persist with actions or an attitude despite the probability that it will cause trouble	be persistent, refuse to stop
	hold the phone line open
	fix to; attach