cast off vs throw away

cast off and throw away both are verbs.

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

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

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

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