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Douglas Harper's Etymology Dictionary
walk-through

also walkthrough, 1944, "an easy part" (in a theatrical production), from walk (v.) + through. Meaning "dry run, full rehearsal" is from 1959, from the notion of "walking (someone) through" something.

WordNet
walk-through
  1. n. a thorough explanation (usually accompanied by a demonstration) of each step in a procedure or process; "she gave me a walk-through of my new duties"

  2. a pedestrian passageway through the ground floor of a building

  3. a first perfunctory rehearsal of a theatrical production in which actors read their lines from the script and move as directed

  4. the act of walking in order to view something; "the realtor took her on a walk-through of the apartment"

Usage examples of "walk-through".

Ytt made tantalum, tantalum made crystals, crystals operated the walk-through that he used to find more Ytt to make .

The piezo crystal of his walk-through was steadily getting further away from the optimum frequency.

Cage, Roman and Kerrie did a sweeping walk-through of the crime scene, then left.

There was a conveyor strip for possessions beside the walk-through entrance, but he held on to the bag.

I turn the expediting over to Cachundo, drag my ass down the Stairmaster for a final walk-through.