Meaning of SLEEPER in English
(RING) [noun] [C] [UK and ANZ] - a small gold or silver ring which is worn in an ear which is pierced (= has a hole in it) to stop the hole from closing while other earrings are not being worna pair of gold sleepersSee also sleeper at sleep (RESTING STATE); sleeper (BLOCK).
Cambridge English vocab. Кембриджский английский словарь. 2012