hold hostage

verb5

1. •
   To hold as hostage.
2. •
   To have possession or custody of (a person) as security for performance against a treaty, a pledge, or a demand, especially now an extra-legal demand.
3. •
   To seek advantage in a situation by threatening the well-being or success of (a person or thing not directly involved in the situation).

   • Mr. President, when someone holds up this bill and holds it hostage, it is holding hostage the money that would go to aid victims of disaster. — 1996
4. •
   To sabotage (a computer) with intent to blackmail the owner.

   • Before Frank could turn in his final exam, Jigsaw held his computer hostage.
5. •
   To hold in custody or use for any advantage.

   • That way, a taxidriver cannot hold the traveler's luggage hostage in the trunk for more money. — 2009