Is down to the last wire an idiom?

"Down to the wire" is indeed an idiom. It means something is happening or being done until the very last possible moment, with little or no time to spare.

Here are some examples of how it's used:

* "The election was down to the wire, with the results not known until the early hours of the morning."

* "We worked down to the wire to finish the project on time."

* "The game was down to the wire, with the winning team scoring in the last minute."

Let me know if you'd like to explore other idioms!