Lunch break; the midday rest period when people eat lunch or take a break at school, work, etc.
昼休みに同僚とレストランへ行った。
I went to a restaurant with colleagues during lunch break.
学校の昼休みは12時から1時までだ。
School lunch break is from 12:00 to 1:00.
昼休みを利用して買い物を済ませた。
I used the lunch break to finish some shopping.