予備軍
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Meanings
1
reserves; reserve army
Primarily military: troops held back for later use. Also used in organizational contexts for backup personnel.
The reserves were sent to the front line.
He is standing by as a reserve.
2
potential members; people at risk; wannabes
Figurative extension: people who may join a group, develop a condition, or aspire to something. Often used in social or medical contexts.
The elderly are said to be at risk of heatstroke.
They are potential future executive candidates.