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walk-through (n.)

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.

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Definitions of walk-through from WordNet

walk-through (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
walk-through (n.)
a pedestrian passageway through the ground floor of a building;
walk-through (n.)
a first perfunctory rehearsal of a theatrical production in which actors read their lines from the script and move as directed;
walk-through (n.)
the act of walking in order to view something;
the realtor took her on a walk-through of the apartment
From wordnet.princeton.edu