slip out vs steal away

slip out and steal away both are verbs.

Word	Noun	Adjective	Verb	Adverb
slip out	No	No	Yes	No
steal away	No	No	Yes	No

As verbs, slip out and steal away are synonyms defined as:

Other synonyms of slip out include slip away, sneak away, sneak off, sneak out.

slip out (verb)	steal away (verb)
leave furtively and stealthily	leave furtively and stealthily