clear the air vs run off

clear the air and run off both are verbs.

Word	Noun	Adjective	Verb	Adverb
clear the air	No	No	Yes	No
run off	No	No	Yes	No

As verbs, run off is a hypernym of clear the air; that is, run off is a word with a broader meaning than clear the air:

Other hypernyms of clear the air include chase away, dispel, drive away, drive off, drive out, turn back.

clear the air (verb)	run off (verb)
dispel differences or negative emotions	decide (a contest or competition) by a runoff
	reproduce by xerography
	force to go away; used both with concrete and metaphoric meanings
	leave suddenly and as if in a hurry
	run away; usually includes taking something or somebody along
	run away secretly with one's beloved
	run off as waste