brustle
To crackle; to rustle.
To make a show of fierceness or defiance; to bristle.
Fath. 'Sbud, I'll brustle up to him. Are you an Atheist, Fellow? hoh?
Cour. Oh, an Atheist, Sir; he believes neither God nor the Devil.
Where it comes from
From Middle English brustlen, variant of brastlen, from Old English brastlian, from Proto-West Germanic *brastulōn, from Proto-Germanic *brastōną. Related to German prasseln (“to crackle”). See burst.
Adapted from the Wiktionary entry brustle (CC BY-SA 4.0).