slide by vs slip away

slide by and slip away both are verbs.

Word	Noun	Adjective	Verb	Adverb
slide by	No	No	Yes	No
slip away	No	No	Yes	No

As verbs, slide by and slip away are synonyms defined as:

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

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