a fold on a bed sheet or blanket made by tucking the foot or head of the sheet straight under the mattress with the ends protruding and then making a diagonal fold at the side corner of the sheet and tucking this under to produce a triangular corner.
HOSPITAL CORNER
Meaning of HOSPITAL CORNER in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012