put away vs deep-six

put away and deep-six both are verbs.

Word	Noun	Adjective	Verb	Adverb
put away	No	No	Yes	No
deep-six	No	No	Yes	No

As verbs, deep-six is a hyponym of put away; that is, deep-six is a word with a more specific, narrower meaning than put away:

put away (verb)	deep-six (verb)
turn away from and put aside, perhaps temporarily	throw from a boat
eat up; usually refers to a considerable quantity of food	toss out; get rid of
kill gently, as with an injection
place in a place where something cannot be removed or someone cannot escape
stop using
throw or cast away
lock up or confine, in or as in a jail