The get-out is the period after a play, concert, or other kind of show, during which everything is removed, and tidied up. Depending on the size of the show, this can be anything from a few hours up to week (the longest I've done has been 3 days)

In the case of theatre, the get-out should be carefully coordinated between the stage manager, chief electrician, and sound engineer, so that they all know what the others are doing, and can plan their job so that the whole get-out can go as quickly as possible.

Normally by this stage of a production, everyone involved is very tired, so it is important not to rush a get-out, as accidents could occur.

At the other end of the show is the get-in, which is done before the show opens.

If you're after any other theatre tech information, then do take a look at 'Everything you ever wanted to know about theatre tech, but were afraid to ask'