《sports》underhand grip (e.g. in gymnastics, etc.)
《sports》cross-handed grip (e.g. in golf, etc.); using one's hands backwards from their conventional positioning
reverse grip (e.g. of a sword)
turning the tables (on an opponent)
《martial arts》reverse arm-lock (in judo); joint lock
逆手に持ったナイフで木を削った。
I whittled the wood with a knife held underhand.
相手の逆手を取って反撃した。
I turned the opponent's move against them and countered.
鉄棒を逆手で握ると力の入り方が変わる。
Gripping the bar underhand changes how you apply force.