Definition of "grouser" [grou•ser]

• A person who grouses; a grumbler (noun)
• A temporary pile driven into the bottom of a river to hold a boat in position; a spud (noun)
• A protrusion on the surface of a wheel or continuous track segment, intended to increase traction in soil, snow, or other loose material (noun)

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• "Any new wrinkle that retailers can offer to create more good will and turn a discomfited grouser into a gratified shopper's companion makes good sense."
• "And whilst he started out in the Labour Party on the far left, he acted as a loyal grouser with his team loyalty coming to the fore as his responsibilities grew."
• "And if you, innocently trying to get a cool drink of water, become the passive recipient of the grousing, instead of stroking your chin while you pretend to listen, kindly ask the grouser if they've thought of doing anything proactive about their issue."