〜うちに means "while" with urgency — do X before the situation changes or the opportunity is lost.
Before it''s too late - While you can, before it changes
During a limited time - While the condition exists
Also: Vている うちに = while doing, gradually...
See examples below for varied real-world usage.
Verb dictionary/ない + うちに = before (something happens)
- 忘れないうちに (before I forget)
Verb ている + うちに = while doing (gradual change)
- 話しているうちに (while talking, gradually...)
Adj/Noun の + うちに = while in that state
- 若いうちに (while young)
Please eat it while it's hot.
Let me take notes before I forget.
In everyday context, Please eat it while it's hot.
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