matter of time

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matter of time (uncountable)

1. (idiomatic) An inevitable result; something that is bound to happen.
   • 2010, “Walk in the Park”, in Victoria Legrand (lyrics), Teen Dream, performed by Beach House:

     In a matter of time it would slip from my mind / In and out of my life, you would slip from my mind / In a matter of time

   • 2011 September 13, Sam Lyon, “Borussia Dortmund 1 - 1 Arsenal”, in BBC‎:

     Dortmund continued to control proceedings, however, and it looked only a matter of time before they would break through.

• question of time