bluster

The story

1. Middle Low German · derived fromblüstren
2. Middle English · inherited fromblusteren“to wander about aimlessly”
3. English todaybluster

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”).