A shoulder lock submission from the side control or mount, isolating the opponent's arm.

In Brazilian Jiu-Jitsu, an "Americana" is a standard submission hold that targets the shoulder joint by applying pressure to the arm, essentially bending it at a 90-degree angle and forcing the opponent to tap out; it's also known as a "keylock" or "ude-garami" in other grappling disciplines and is considered a basic shoulder lock technique that can be applied from various positions on the mat.
Key points about the Americana:
• Mechanism:
The practitioner typically gains control of the opponent's wrist with a figure-four grip, then twists the wrist laterally while lifting the elbow to hyperextend the shoulder joint.
• Other names:
"Keylock," "Figure-four armlock," "Bent armlock," "Paintbrush," "Ude-garami"
• Application:
It can be performed from various positions like mount, side control, or even from the guard.