(uncountable) The juice of plants of any kind, especially the ascending and descending juices or circulating fluid essential to nutrition. / (uncountable) The sapwood, or alburnum, of a tree.

(transitive) To drain, suck or absorb from (tree, etc.). / (transitive, figuratively) To exhaust the vitality of.

(countable, US, slang) A short wooden club; a leather-covered hand weapon; a blackjack.

(transitive, slang) To strike with a sap (with a blackjack).

(military) A narrow ditch or trench made from the foremost parallel toward the glacis or covert way of a besieged place by digging under cover of gabions, etc.

(transitive) To subvert by digging or wearing away; to mine; to undermine; to destroy the foundation of. / (transitive, military) To pierce with saps.

Initialism of Scientific Advisory Panel. / (South Africa) Initialism of South African Police. / (South Africa, obsolete) Initialism of South Africa Party.

(Britain) Initialism of statutory adoption pay. Payments made by an employer to an employee who is absent from work after the adoption of a child. / (US, military) Initialism of special access program.

(poetic) Full of sap; sappy; tasteful.

plural of sap