Problems, difficulties, or a situation that causes worry or pain.
From Old French *trouble* “disturbance,” from Latin *turbulare* “to disturb,” from *turba* “turmoil, crowd.” It originally meant physical disturbance and later broadened to emotional and social difficulties.
Trouble and turbulence are cousins: both come from the idea of things being stirred up and not calm. Whether it’s rough airplane air or a messy friendship, the language treats them as the same kind of shaking.
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