elapse vs slip away

elapse and slip away both are verbs.

Word	Noun	Adjective	Verb	Adverb
elapse	No	No	Yes	No
slip away	No	No	Yes	No

As verbs, elapse and slip away are synonyms defined as:

Other synonyms of elapse include glide by, go along, go by, lapse, pass, slide by, slip by.

elapse (verb)	slip away (verb)
for time to move forward	for time to move forward
	leave furtively and stealthily