What does the word surety mean?

Usage examples for surety

  1. This is the matter he spoke of, no doubt hoping that it would make me more merciful, therefore, of a surety I think it is a lie. – Caste by W. A. Fraser
  2. Again, if there is a surety for any of the debts, he may insist on the application of the money in order to be relieved. – Putnam's Handy Law Book for the Layman by Albert Sidney Bolles
  3. Gradually Robert dropped farther and farther in the rear; it gave him that much more protection, that much more surety in trailing his quarry to wherever he might be bound. – The Cross-Cut by Courtney Ryley Cooper