Flowing sheet

(Naut.) a sheet when eased off, or loosened to the wind, as when the wind is abaft the beam.
- Totten.

See also: Flowing

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
"A fair wind and a flowing sheet, you know, or however it goes."
at his own face reflected in a flowing sheet of creek.