grousing

The verb 'grouse', meaning to complain or grumble, first appeared in British military slang around the late 1880s. Its exact origin is obscure, but it is not derived from the bird 'grouse'; it is a distinct, slang formation. The '-ing' suffix is the standard English present participle ending, used here to form the verbal noun or adjective describing the ongoing action of complaining. Thus, 'grousing' literally means "the act of complaining in a peevish manner," a sense that has remained consistent from its slang origins to its modern, slightly informal usage.

Structure: grous (to grumble) + ing (present participle suffix) The morpheme 'grous' originates from the late 19th-century verb 'grouse', of uncertain but possibly military slang origin. The morpheme 'ing' is a present participle suffix from Old English '-ende', '-inge'.