dressed to kill vs spruced up

dressed to kill and spruced up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dressed to kill	No	Yes	No	No
spruced up	No	Yes	No	No

As adjectives, dressed to kill and spruced up are synonyms defined as:

Other synonyms of dressed to kill include dolled up, dressed-up, dressed, dressed to the nines, spiffed up, togged up.

dressed to kill (adjective)	spruced up (adjective)
dressed in fancy or formal clothing	dressed in fancy or formal clothing