step on it vs dash

step on it is not a noun while dash is a noun.

Word	Noun	Adjective	Verb	Adverb
step on it	No	No	Yes	No
dash	Yes	No	Yes	No

As verbs, dash is a hyponym of step on it; that is, dash is a word with a more specific, narrower meaning than step on it:

Other hyponyms of step on it include barge, push forward, thrust ahead, buck, charge, shoot, shoot down, tear, dart, flash, scoot, scud, shoot.

step on it (noun)	dash (noun)
	a quick run
	the act of moving with great haste
	distinctive and stylish elegance
	the longer of the two telegraphic signals used in Morse code
	a punctuation mark (-) used between parts of a compound word or between the syllables of a word when the word is divided at the end of a line of text
	a footrace run at top speed

step on it (verb)	dash (verb)
move hurridly	break into pieces, as by striking or knocking over
	add an enlivening or altering element to
	hurl or thrust violently
	cause to lose courage; to be daunted; to be scared away
	run or move very quickly or hastily
	destroy or break