Meaning

noun the act of waving

verb move or swing back and forth

verb exhibit aggressively

originFrom Middle English braundischen, from Old French brandiss-, stem of brandir (“to flourish a sword”), from Frankish *brandijan, from Frankish *brand (“firebrand; sword”), from Proto-Germanic *brandaz (“fire; flame; sword”), whence Old English brand (“firebrand; torch”); equivalent to brand + -ish. More at brand.

Etymology from Wiktionary, CC BY-SA 3.0