ace in the hole

But Toranaga has an ace in the hole.

Trump's favorite campaign strategy is immigrant bashing and they hoped it would be their ace in the hole.

“We also looked at Wilder’s “Ace in the Hole” for when the carnival comes to town and “It Happened One Night” for the way it stages a motor court.…

Stockhausen and Anderson diligently studied both location and stage-bound American desert films such as “Ace in the Hole,” “Kiss Me, Stupid” and “Bad Day at Black Rock” but wanted the control and heightened look that creating their own wasteland enabled.

This is our ace in the hole — the real power we have as consumers over the oil cartel.