bustle v.

Middle English bresten, from Old English berstan (intransitive) "break suddenly, shatter as a result of pressure from within" (class III strong verb; past tense bærst, past participle borsten), from a West Germanic metathesis of Proto-Germanic *brest- (source also of Old Saxon brestan, Old Frisian bersta, Middle Dutch berstan, Low German barsten, Dutch barsten, Old High German brestan, German bersten "to burst").

The forms reverted to brest- in Middle English from influence of Old Norse brestan/brast/brosten, from the same Germanic root, but it was re-metathesized late 16c. and emerged in the modern form, though brast was common as past tense through 17c. and survives in dialect.

In Old English "Chiefly said of things possessing considerable capacity for resistance and breaking with loud noise; often of cords, etc., snapping under tension; also of spears, swords, etc., shivered in battle" [OED]; in late Old English also "break violently open as an effect of internal forces." Figuratively, in reference to being over-full of excitement, anticipation, emotion, etc., from c. 1200.

The transitive sense ("to cause to break, cause to explode") is from late 13c. The meaning "to issue suddenly and abundantly" is from c. 1300 (literal), mid-13c. (figurative). The meaning "break (into) sudden activity or expression" is from late 14c. Related: Bursting.

c. 1300, "to prepare, to dress oneself," also "to go, set out," probably from Old Norse buask "to prepare oneself," reflexive of bua "to prepare" (see bound (adj.2)) + contraction of Old Norse reflexive pronoun sik. Most common in northern Middle English and surviving chiefly in Scottish and northern English dialect. Related boun had the same senses in northern and Scottish Middle English. Related: Busked; busking.

The nautical term is attested from 1660s (in a general sense of "to tack, to beat to windward"), apparently from obsolete French busquer "to shift, filch, prowl," which is related to Italian buscare "to filch, prowl," Spanish buscar (from Old Spanish boscar), perhaps originally from bosco "wood" (see bush (n.)), with a hunting notion of "beating a wood" to flush game. For the "perform in public" sense, see busker.