语源
Old English sæp, probably of Germanic origin. The verb (dating from the mid 18th cent.) is often interpreted as a figurative use of the notion ‘drain the sap from’, but is derived originally from the verb sap, in the sense underminelate 16th cent. (as a verb in the sense dig a sap or covered trench): from French saper, from Italian zappare, from zappaspade, spadework, probably from Arabic sarabunderground passage, or saboraprobe a wound, exploreearly 19th cent.: abbreviation of dialect sapskullperson with a head like sapwood, from sap (in the sense sapwood) + skulllate 19th cent. (as a noun): abbreviation of sapling (from which such a club was originally made)