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impulse buy UK US noun [C] (also impulse purchase)
► something that you buy without having planned it, and without thinking carefully: »
I hadn't intended to get another pair of shoes - it was an impulse buy.
impulse buyer noun [C] (also impulse purchaser)
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The snack food marketplace is largely an impulse buyers' market.
impulse buying noun [U] (also impulse purchasing)
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Supermarkets have reported a huge increase in impulse buying.
Financial and business terms. 2012.