Definition of pass-through in US English:

pass-through

noun

  • 1An act or instance of passing through, or passing something through.

  • 2Originally US. The action of passing on a cost to a customer; an instance of this.

  • 3A hatch through which food, etc., may be passed from one room to another.

  • 4North American. A state, city, etc., through which funds are passed on to another destination, without any being retained by it.

adjective

  • 1Originally US. Of costs, etc.: that are passed on to the buyer; chargeable to the customer.

  • 2Denoting a hatch, window, etc., through which food, plates, etc., may be passed.

Origin

Late 19th century (in an earlier sense). From pass + through, after to pass through ——.