Definition of sap noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//sæp//
    ; NAmE NAmE//sæp//
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  1. 1 [uncountable] the liquid in a plant or tree that carries food to all its parts Maple syrup is made from sap extracted from the sugar maple tree.
  2. 2[countable] (informal, especially North American English) a stupid person that you can easily trick, or treat unfairly The poor sap never knew what was going on behind his back. See related entries: Stupid
  3. Word Originnoun sense 1 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 ‘undermine’. noun sense 2 early 19th cent.: abbreviation of dialect sapskull ‘person with a head like sapwood’, from sap (in the sense ‘sapwood’) + skull.
See the Oxford Advanced American Dictionary entry: sap

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