(also cop·ula ) noun
( grammar ) 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.
LINKING VERB
Meaning of LINKING VERB in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005