overbear vs bear down

overbear and bear down both are verbs.

Word	Noun	Adjective	Verb	Adverb
overbear	No	No	Yes	No
bear down	No	No	Yes	No

As verbs, overbear and bear down are synonyms defined as:

overbear and bear down: contract the abdominal muscles during childbirth to ease delivery

overbear (verb)	bear down (verb)
contract the abdominal muscles during childbirth to ease delivery	exert a force or cause a strain upon
bear too much	pay special attention to
overcome	exert full strength
	to make a rush at or sudden attack upon, as in battle
	exert a force with a heavy weight
	contract the abdominal muscles during childbirth to ease delivery