Definition of linking verb noun from the Oxford Advanced Learner's Dictionary

 

linking verb

 noun
noun
BrE
 
; NAmE
 
(also copula)(grammar)
 
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a verb such as be or become that connects a subject with the adjective or noun (called the complement ) that describes it In ‘She became angry’, the verb ‘became’ is a linking verb.
See the Oxford Advanced American Dictionary entry: linking verb