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sap [sap 词源字典]: sap: English has three distinct words sap. The oldest, ‘plant-juice’ [OE], goes back to a prehistoric Germanic *sappam, which also produced German saft ‘juice’. This in turn was a descendant of Indo-European *sapon-, from which came Latin sapa ‘new wine’. Sap ‘undermine’ [16] was borrowed via French saper from Italian zappare, which may have been ultimately of Arabic origin.

Its original literal sense ‘dig a trench or tunnel underneath in order to attack’ has now been largely superseded by the metaphorical ‘weaken’, which has been heavily influenced by sap ‘plant-juice’ (from the notion of ‘draining sap from a plant’). The colloquial sap ‘fool’ [19] may be short for an earlier sapskull, a compound formed from sap in the now seldom heard sense ‘sapwood’ – hence ‘wooden head’.
[sap etymology, sap origin, 英语词源]
basin (n.): "large shallow vessel or dish," c. 1200, from Old French bacin (11c., Modern French bassin), from Vulgar Latin *baccinum, from *bacca "water vessel," perhaps originally Gaulish. Meaning "large-scale artificial water-holding landscape feature" is from 1712. Geological sense of "tract of country drained by one river or draining into one sea" is from 1830.
drain (v.): Old English dreahnian "to drain, strain out," from Proto-Germanic *dreug-, source of drought, dry, giving the English word originally a sense of "make dry." Figurative meaning of "exhaust" is attested from 1650s. The word is not found in surviving texts between late Old English and the 1500s. Related: Drained; draining.
exhaustion (n.): 1640s, "fatigue," noun of action from exhaust (v.) in sense of "drawing off" of strength. Etymological sense "act of drawing out or draining off" is from 1660s in English.
sap (v.1): "dig a trench toward the enemy's position," 1590s, from Middle French saper, from sappe "spade," from Late Latin sappa "spade" (source also of Italian zappa, Spanish zapa "spade"). Extended sense "weaken or destroy insidiously" is from 1755, probably influenced by the verb form of sap (n.1), on the notion of "draining the vital sap from." Related: Sapped; sapping.
exsanguination: "The action of draining a person, animal, or organ of blood", Early 20th century: from Latin exsanguinatus 'drained of blood' (from ex- 'out' + sanguis, sanguin- 'blood') + -ion.