Definition of the birch
- In those days, schoolchildren got the birch when they misbehaved.
: any of a genus (Betula of the family Betulaceae, the birch family) of monoecious deciduous trees or shrubs having simple petioled leaves and typically a layered membranous outer bark that peels readily
: the hard pale close-grained wood of a birch
: a birch rod or bundle of twigs for flogging
: to beat with or as if with a birch : whip
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