I. bel ‧ ly ‧ ache 1 /ˈbeli-eɪk/ BrE AmE noun [uncountable and countable] informal
a pain in your stomach SYN stomachache
II. bellyache 2 BrE AmE verb [intransitive] informal
to complain a lot, especially about something unimportant SYN whinge
bellyache about
She never stops bellyaching about money.