The crossword solutions for the term 'Sink or Swim' is VERB, which is a four letter word. The phrase 'sink or swim' is an idiom that means to either succeed or fail on one's own efforts. It is often used to describe a situation where someone is forced to rely on their own abilities and resources in order to survive or succeed. This phrase is often used to encourage someone to take risks and try something new, even if it may be difficult.