Intentionally harassed, intimidated, or hurt someone weaker or vulnerable; treated cruelly.
From Dutch 'boel' or 'boele' (lover, brother), which evolved to mean 'blustering fellow' and then 'person who uses strength to intimidate.' Entered English in the 16th century.
The word 'bully' originally meant a friend or buddy in Dutch—it's wild how the same word completely flipped meaning to describe someone who hurts others, showing how language can record cultural shifts in behavior.
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