Sap is:

• tree sap
• A small, blunt object used as a weapon, often constructed from a bag filled with loose, heavy objects such as lead shot or coins.
• A tunnel or trench made by sapping.
• Sap is a 1992 EP by Alice in Chains.
• Colloquially, a sap is a weak or gullible person, or a dupe ; see confidence trick.

• The abbreviation or acronym SAP, please see SAP.