n. 1.a rester who is sleeping 2.a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal 3.an unexpected achiever of success 4.one of the cross braces that support the rails on a railway track 5.a passenger car that has berths for sleeping 6.a piece of furniture that can be opened up into a bed 7.tropical fish that resembles a goby and rests quietly on the bottom in shallow water 8.an unexpected hit