Collins COBUILD Advanced Learner's English Dictionary - bellyache

also belly-ache (bellyaches, bellyaching, bellyached) 1. Bellyache is a pain inside your abdomen, especially in your stomach. (INFORMAL) = stomach-ache N-VAR 2. If you say that someone is bellyaching, you mean they complain loudly and frequently about something and you think this is unreasonable or unjustified. (INFORMAL) ...belly-aching about recession. = complain VERB: usu cont, V about n, also V