shake off vs cast off

shake off and cast off both are verbs.

Word	Noun	Adjective	Verb	Adverb
shake off	No	No	Yes	No
cast off	No	No	Yes	No

As verbs, shake off and cast off are synonyms defined as:

Other synonyms of shake off include cast, drop, shed, throw, throw away, throw off.

shake off (verb)	cast off (verb)
to remove	to remove
get rid of	make the last row of stitches when knitting