Bluster

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late Middle English: ultimately imitative.

wiktionary

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From Middle English blusteren(“to wander about aimlessly”); however, apparently picking up the modern sense from Middle Low German blüstren(“to blow violently”; compare later Low German blustern, blistern). Related to blow, blast. Compare also Saterland Frisian bloasje(“to blow”), bruusje(“to bluster”).

etymonline

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bluster (v.)

late 14c., "stray blindly or blunderingly, wander aimlessly, go astray;" c. 1400, of persons, "shout loudly and angrily," from a Low German source, such as Middle Low German blüstren "to blow violently," East Frisian blüstern "to bluster," probably from the same source as blow (v.1), or perhaps imitative. Of weather in English from mid-15c. Related: Blustered; blustering.

bluster (n.)

1580s, "a storm of violent wind," from bluster (v.). Meaning "noisy, boisterous, inflated talk" is from 1704.