Noun
undergrip (plural undergrips)
(weightlifting, gymnastics) supinated grip
A bar routine, which is a sequence of several bar skills, usually includes giants with various grips (overgrip, undergrip, dorsal grip, mixed grip), in-bar work, turns, release and regrasp skills, and a dismount. Source: Internet
Thumbs are turned out, but in the opposite direction of an undergrip. Source: Internet