throw overboard vs deep-six

throw overboard and deep-six both are verbs.

Word	Noun	Adjective	Verb	Adverb
throw overboard	No	No	Yes	No
deep-six	No	No	Yes	No

As verbs, throw overboard and deep-six are synonyms defined as:

throw overboard (verb)	deep-six (verb)
throw from a boat	throw from a boat
lose (something) or lose the right to (something) by some error, offense, or crime	toss out; get rid of