Increases or improves something, or helps lift something upward; gives a push or increase in power or confidence.
From possibly Scandinavian origin, related to Old Norse boast (to swell). The word entered English in the 1600s with the meaning of 'to push upward.'
Socially, a 'confidence boost' actually changes brain chemistry—positive reinforcement increases dopamine, which explains why a compliment can literally rewire your nervous system for better performance!
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