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1. walk-through
To pass trough a non-smoking area with a lit cigarette. What makes a walk-through different from just smoking in the house (or wherever) is that the person makes an effort to get to the next smoking area as quickly as possible. In addition, hitting the cigarette nullifies the walk-through and thus constitutes "smoking in the house."
Rob: Hey I'm going out back, is it ok if I walk-through?

Marty: Yeah, go for it.

{As Rob is executing his walk-through from the front porch to the backyard he encounters Morgan}

Morgan: Hi Rob! How's is going?

Rob (with cigarette raised): Not bad, but I can't talk. I'm doin a walk-trough.
2. walk-through

1. a rehearsal

2. a slow, careful explanation

3. to explain something slowly and carefully
We did a walk-through of the movie before collecting ideas.
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