Hold someone or something to ransom - Idioms by The Free Dictionary
hold someone or something to ransom
hold (one) to ransom
To demand something or some action from someone by threatening them with a harmful consequence if they do not comply. Threatening us with a fine if we don't participate in the survey is a bit like holding us to ransom, isn't it?
hold someone or something to ransom 1 hold someone prisoner and demand payment for their release. 2 demand concessions from a person or organization by threatening damaging action.