verb (used with object)
to force too much into:
If you overstuff your suitcase, the fastenings may not hold.
to cover completely with deep upholstery.
to force too much into
to cover (furniture) entirely with upholstery
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Do not overstuff the boxes since they will not close properly and may come open during the move.
Eat a nutritious meal, but do not overstuff yourself and avoid heavy foods.
Overstuff the boxes in which the binders are packed, as these may break open in shipment.