To make someone feel sad or unhappy; to cause sorrow or melancholy.
From 'sad,' which comes from Old English 'sæd' meaning 'satisfied' or 'heavy'; evolved to mean emotionally heavy around the 1200s. The verb form developed naturally from the adjective.
The original meaning of 'sad' was literally 'full' or 'heavy' (like sad soil is heavy with moisture)—so sadness is like emotional heaviness weighing down on you!
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