for something to hit or touch the hands
to raise one's hand―lift up one's hand―(採決の時なら)―show one's hand―(敬礼なら)―touch one's cap
手があく
手を取ること
Hold up your hands.
to lend one a hand―lend one a helping hand―lend one assistance
(自分の手なら) to let go one's hold―release one's hold―loose one's hold―(人の手なら)―let go of one's hand―leave hold of one's hand―disengage one's hand―free one's hand