Throw overboard is an idiom that means to DISCARD or get rid of something. It can be used in a literal sense, such as throwing something off a boat, or in a figurative sense, such as getting rid of a bad habit. The crossword solutions for this term are DISCARD (7 letters) and JETTISON (8 letters). DISCARD means to get rid of something, while JETTISON means to throw something away, usually from a ship or aircraft. Both words imply the act of getting rid of something, which is the same meaning as the idiom throw overboard.