An idiom meaning to be unable to do anything about a situation; to have no way to deal with it ('hands and feet can't move').
不正の証拠がはっきりしていて、相手は手も足も出ない状況だ。
The evidence of wrongdoing is clear; the other side is in a situation where they can't do anything.
相手チームの実力が予想以上で、今日は手も足も出なかった。
The opposing team's strength was greater than expected; we were totally outmatched today.
詐欺の手口が巧妙で、被害者は手も足も出なかった。
The scam was so sophisticated that the victims were helpless.