the.com/bully

Insecurity wearing someone else's dignity as a costume.

means Someone who uses size, power, or threat to intimidate or hurt people they see as weaker.

from Ironically, 'bully' started out as a term of affection — in the 1500s it meant 'sweetheart' or 'fine fellow,' probably from the Dutch 'boel,' meaning lover or brother. Over the 1600s it curdled: the word drifted through 'blustering protector' to 'harasser of the weak,' possibly as swaggering 'protectors' revealed themselves as thugs for hire. By the time 'bully' settled into its modern sense, it had completely reversed itself — one of language's small, grim ironies.

origin shift
word once meant sweetheart in the 1500s
power source
needs an audience to actually work
adult version
gets promoted and called assertive
root cause
usually bullied somewhere else first
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