promisor

plural promisors

1. businessOne who engages or undertakes; a promiser.

   […]the creditor may request the promisor to perform his obligation to a third party.

   2018, Adrian Briggs, Andrew Burrows, “Chapter 22: Formation and Third Party Rights in the Myanmar Law of Contract”, in Mindy Chen-Wishart, Alexander Loke, Stefan Vogenauer, editors, Formation and Third Party Beneficiaries, Oxford University Press, page 476

   2 more examples

   Each of two or more joint promisors may compel every other joint promisor to contribute equally with himself to the performance of the promise, unless a contrary intention appears from the contract.

   1873, Andrew Lyon, Law of India, Volume 1: The Codes, page 15

   This may be attributable to a personal mistake of the promisor or negligence of her estate planner.

   2022, Alexandra Braun, Claiming a Promised Inheritance: A Comparative Study, Oxford University Press, page 105