2. Hence, an opening or channel through which anything flows; a source of supply. Each sluice of affluent fortune opened soon. (Harte) This home familiarity . . . Opens the sluices of sensibility. (I. Taylor)
Origin: OF. Escluse, F. Ecluse, LL. Exclusa, sclusa, from L. Excludere, exclusum, to shut out: cf. D. Sluis sluice, from the Old French. See Exclude.