slip by vs march on

slip by and march on both are verbs.

Word	Noun	Adjective	Verb	Adverb
slip by	No	No	Yes	No
march on	No	No	Yes	No

As verbs, march on is a hypernym of slip by; that is, march on is a word with a broader meaning than slip by:

Other hypernyms of slip by include advance, go on, move on, pass on, progress.

slip by (verb)	march on (verb)
for time to move forward	move forward, also in the metaphorical sense