Food bought from a restaurant to eat somewhere else, or the main lesson or message you take away from something.
From 'take' (Old English 'tacan') and 'away' (Old English 'aweg'). The restaurant meaning emerged in the 1950s-60s as British English, later becoming 'takeout' in American English.
The British and American versions—'takeaway' versus 'takeout'—are basically the same thing described as either what you're taking away or what you're taking out, showing how the same concept can be viewed from opposite directions.
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