gustr

Gust comes from Old Norse gustr (a cold blast, a gust), related to gjósa (to gush, to spurt). The Norse connection between gushing water and blasting wind is physical: both are sudden, forceful flows of fluid. The Vikings, who spent their lives on water and in wind, made no categorical distinction between the two. Fluid was fluid. A gust of wind and a gush of water were the same phenomenon in different media.

The word entered English during the Viking Age, when Norse-speaking settlers in northern and eastern England introduced hundreds of words into English. Gust joined sky, skill, skin, egg, window, and hundreds of other Norse loans that English adopted so thoroughly they feel native. The word has no competing Old English equivalent that survived — whatever the Anglo-Saxons called a sudden wind blast was replaced by the Norse term.

A gust is technically a brief increase in wind speed above the sustained average, lasting less than twenty seconds. The National Weather Service reports gust speeds separately from sustained winds because gusts are what cause damage. A sustained wind of thirty miles per hour can be withstood by structures designed for it. A gust of sixty miles per hour on the same day cannot. The brief spike is more dangerous than the constant flow.

The word has remained small and physical. Unlike 'storm' or 'tempest,' 'gust' has resisted grand figurative extension. A gust of laughter exists but is uncommon. A gust of anger is rare. The word stays close to its physical origin — a sudden, brief, forceful push of air. The Norse gush has not inflated.