blow out of the water vs take aback

blow out of the water and take aback both are verbs.

Word	Noun	Adjective	Verb	Adverb
blow out of the water	No	No	Yes	No
take aback	No	No	Yes	No

As verbs, blow out of the water and take aback are synonyms defined as:

blow out of the water and take aback: surprise greatly; knock someone's socks off

Other synonyms of blow out of the water include ball over, floor, shock.

blow out of the water (verb)	take aback (verb)
surprise greatly; knock someone's socks off	surprise greatly; knock someone's socks off