throw off vs cast off

throw off and cast off both are verbs.

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

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

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

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