get a line vs ascertain

get a line and ascertain both are verbs.

Word	Noun	Adjective	Verb	Adverb
get a line	No	No	Yes	No
ascertain	No	No	Yes	No

As verbs, ascertain is a hyponym of get a line; that is, ascertain is a word with a more specific, narrower meaning than get a line:

Other hyponyms of get a line include get the goods, wise up, catch, trip up.

get a line (verb)	ascertain (verb)
get to know or become aware of, usually accidentally	be careful or certain to do something; make certain of something
	learn or discover with certainty
	find out, learn, or determine with certainty, usually by making an inquiry or other effort
	establish after a calculation, investigation, experiment, survey, or study