Definition of they're in English:

they're

contraction

  • They are.

    • ‘If they're asking too many personal questions, it's okay not to answer.’
    • ‘Women are more successful at infidelity than men - they're better liars.’
    • ‘They're very useful.’
    • ‘I wonder if he'll complain if they're used against him.’
    • ‘They're already here!’
    • ‘The cheapness and ubiquity of plastics, and the problems caused when they're carelessly thrown away, blind us to the utility and versatility of these marvellously mutable materials.’

Usage

On the differences between their, they're, and there, see they

Pronunciation:

they're

/T͟Her/