unlearn - discard something previously learnt, like an old habit

deep-six, give it the deep six - toss out; get rid of; "deep-six these old souvenirs!"

jettison - throw away, of something encumbering

junk, scrap, trash - dispose of (something useless or old); "trash these old chairs"; "junk an old car"; "scrap your old computer"

waste - get rid of; "We waste the dirty water by channeling it into the sewer"

get rid of, remove - dispose of; "Get rid of these old shoes!"; "The company got rid of all the dead wood"

dump - throw away as refuse; "No dumping in these woods!"

pension off, retire - dispose of; as of old clothes; "She finally retired that old coat"

abandon - forsake, leave behind; "We abandoned the old car in the empty parking lot"

liquidize, sell out, sell up - get rid of all one's merchandise

de-access - dispose of by selling; "the museum sold off its collection of French impressionists to raise money"; "the publishing house sold off one of its popular magazines"

close out - terminate by selling off or disposing of; "He closed out his line of sports cars"