noun
in one's hands; under one's control
Used for having something physically in hand or, more often, having it within one's power or control. Common in phrases like 手中にある, 手中に収める, and 手中に落ちる.
証拠はすでに警察の手中にある。
The evidence is already in the hands of the police.
彼は会社の経営権を手中に収
He gained control of the company's management.