In grammar this word is used in two separate but linked ways:
 It describes a particular word class in the same way that ‘noun’, ‘preposition’, and ‘adjective’ do.
 It describes a part of a clause in the same way that ‘subject’, ‘object’, and ‘complement’ do. In this sense it is sometimes called the verb phrase.
As a word class, verbs are used for three main purposes:
 To express an action:
She fled upstairs to the bathroom.
 To express a state:
She slept noiselessly.
 To link the subject with its complement:
She was alone.
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