Definition of they're in English:

they're

contraction

  • They are.

    • ‘I wonder if he'll complain if they're used against him.’
    • ‘Women are more successful at infidelity than men - they're better liars.’
    • ‘They're very useful.’
    • ‘They're already here!’
    • ‘If they're asking too many personal questions, it's okay not to answer.’
    • ‘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//ðɛr/