break off vs bog down

break off and bog down both are verbs.

Word	Noun	Adjective	Verb	Adverb
break off	No	No	Yes	No
bog down	No	No	Yes	No

As verbs, bog down is a hyponym of break off; that is, bog down is a word with a more specific, narrower meaning than break off:

Other hyponyms of break off include fracture, bog, break up, cut off, disrupt, interrupt.

break off (verb)	bog down (verb)
prevent completion	cause to slow down or get stuck
interrupt before its natural or planned end	get stuck while doing something
break a small piece off from	be unable to move further
break off (a piece from a whole)	cause to get stuck as if in a mire
break a piece from a whole