To play a wind instrument in a way that produces a low-pitched rumbling sound.
Origin
From Middle English groulen, grollen, gurlen, either possibly from Old French groler (variant of croler), grouler, grouller, from Frankish *grullen, *gruljan or from Old English gryllan, both from Proto-Germanic *gruljaną ("to make a sound; to growl, grumble, rumble"), from Proto-Indo-European *gʰer- ("to make a noise; to mumble, murmur; to rattle; to grind; to rub, stroke"), probably ultimately imitative. The word is cognate with Middle Dutch grollen ("to make a noise; to croak, grumble, murmur; to be angry") (modern Dutch grollen ("to grumble")), German grollen ("to rumble; to be angry, bear ill will"), Old English grillan, griellan. Compare grill.
The noun is derived from the verb.
Modern English dictionary
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