cast off vs throw off

cast off and throw off both are verbs.

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

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

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

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