Eating a midday meal, typically something lighter than dinner.
From 'lunch,' which originated in the 1820s as British slang, possibly from 'luncheon,' which may derive from 'lump' or Spanish 'lonja' (slice). The '-ing' form makes it a present participle.
The word 'lunch' is surprisingly young—it didn't exist before the 1820s! Before that, people had breakfast, dinner (at midday), and supper. The Industrial Revolution created the need for a quick midday meal, and the word was born right when factory workers needed it.
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