Loose lips sink ships was an old saying that evolved out of world war two and it specifically meant that people who talked too much could damage the war effort and aid the enemy. This was a very real concern during the time because the grape vine was rife with rumors of Nazi spies creeping all over the place. The person you were Dating on the singles scene could be a spy. Anyone could be a spy and so it was very important that you not speak of things that could provide them with information.
