I. grouch 1 /ɡraʊtʃ/ BrE AmE noun informal
[ Date: 1800-1900 ; Origin: Probably from grutch 'complaint' (14-19 centuries) , from Old French grouchier 'to complain' ]
1 . [countable] someone who is always complaining:
an old grouch
2 . [countable] something unimportant that you complain about
II. grouch 2 BrE AmE verb [intransitive] informal
to complain in a slightly angry way SYN moan
grouch about
He’s always grouching about something!