{n. phr.} One of many; not the only one of the kind; not the only one available. * /He said he could find other girls - she was not the only fish in the sea./ Compare: NOT THE ONLY PEBBLE ON THE BEACH.
NOT THE ONLY FISH IN THE SEA
Meaning of NOT THE ONLY FISH IN THE SEA in English
Dictionary of English idioms . Словарь английских идиом. 2012