In football, an audible is a change in the play call made by the quarterback at the line of scrimmage. The quarterback "audible"s to a different play based on what he sees from the opposing team's defense.
So, to "pull an audible" means to:
* Make a change of plans at the last minute.
* Improvise or adapt to a situation.
* Go off script.
It's used in a broader context to describe any situation where someone changes their approach or decision suddenly.
Here are some examples:
* "We were supposed to go to the beach, but the weather turned bad, so we pulled an audible and went to the movies instead."
* "The speaker pulled an audible and decided to answer the audience's questions before giving his speech."
* "The project was supposed to be finished by Friday, but we pulled an audible and extended the deadline by a week."
In essence, it implies a quick thinking, flexible approach to handling a situation.