noun
Acronym for Anterior Cruciate Ligament, a ligament in the knee that connects the thigh bone to the shin bone.
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The ACL is a crucial ligament in the knee that helps stabilize the joint.
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I tore my ACL playing basketball and had to get surgery.
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Dude, did you see that guy's ACL get wrecked during the game?
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The ACL of the project is the budget allocation, we need to make sure it's secure.