bear down on vs bear down

bear down on and bear down both are verbs.

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

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

Other synonyms of bear down on include drag down, press down on, weigh down.

bear down on (verb)	bear down (verb)
exert a force with a heavy weight	exert a force or cause a strain upon
sail towards another vessel, of a ship	pay special attention to
	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