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English definition of “sap”

sap

verb [T] uk   /sæp/ (-pp-) us  
to make someone weaker or take away strength or an important quality from someone, especially over a long period of time: Constant criticism saps you of your confidence. Taking care of her dying mother had sapped all her energy.Becoming and making less strong
sapping
adjective uk   /ˈsæp.ɪŋ/ us  
sapping heat/humidityBecoming and making less strong

sap

noun uk   /sæp/ us  

sap noun (LIQUID)

[U] the liquid that carries food to all parts of a plant: Maple syrup is obtained from the sap of the sugar maple tree.Plant biochemistry

sap noun (PERSON)

[C] mainly US informal a stupid person who can easily be tricked or persuaded to do something: He's a sap for (= he can easily be persuaded to buy) any new machine.Stupid and silly people
(Definition of sap from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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