grouse \grous\,
verb:
1. To grumble; complain.
noun:
1. A complaint.
Today, he went on to grouse about some "pipsqueak" new arrival at Claverack who was only thirteen.
-- Lionel Shriver, "We Need To Talk About Kevin"
He continued to grouse as they headed toward the taxi line.
-- James Rollins, "The Doomsday Key"
Grouse originally referred to a type of bird. It is uncertain why it began to mean "to complain," though it bears a resemblance to the word grouch.
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