In a manner characterized by strong gusts of wind; in a gusty or blustery way.
From 'gusty' (full of gusts, from Old Norse 'gustr') plus the English adverbial suffix '-ly,' standard formation for turning adjectives into adverbs.
Adverbs in English are typically formed by adding '-ly' to adjectives, so 'gusty' becomes 'gustily'—but this simple rule creates some tongue twisters, and English speakers often just say 'with gusts' to avoid the awkward sound.
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