Definition of "Sheet" :

noun: a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel

noun: bed linen consisting of a large rectangular piece of cotton or linen cloth; used in pairs

noun: (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind

noun: a flat artifact that is thin relative to its length and width

noun: paper used for writing or printing

noun: newspaper with half-size pages

noun: any broad thin expanse or surface

"A sheet of ice."

noun: (mathematics) an unbounded two-dimensional shape

verb: cover with a sheet, as if by wrapping

"Sheet the body."

verb: come down as if in sheets

"The rain was sheeting down during the monsoon."