Osaekomi

Osaekomi is the judo name for the broader pinning category that includes side control and its variants — the configuration in which the attacker holds the opponent flat on their back with chest-to-chest connection, the foundational top-position pin in judo’s osaekomi-waza catalogue.

Etymology. Osaekomi (抑え込み) means “pinning” or “holding down” in Japanese. The term covers the entire osaekomi-waza (pinning-techniques) classification in Kodokan judo — kesa gatame, yoko shiho gatame, kami shiho gatame, tate shiho gatame, and the variants. In modern submission grappling vocabulary the term has narrowed to refer specifically to side control (the most common pin in the broader category) when used as a single-word descriptor; the broader judo category meaning is preserved in formal instructional contexts. Judo competition uses osaekomi as the referee’s call to start the pin’s time count when the pin condition is established.

Mechanics. The configuration positions the attacker perpendicular to the defender with chest-to-chest connection covering the chest and one shoulder line. The attacker’s lower body posts wide for stability; the upper body controls the defender’s head and one arm. The configuration’s defining property is the chest contact that prevents the defender from creating frame space and rolling out, with the perpendicular orientation closing the most accessible escape angles.

Cross-reference. English-speaking no-gi and BJJ use “side control” or “cross-side”; judo uses yoko shiho gatame for the specific four-corners variant. Full mechanical coverage on Side Control.