fail to fulfil
to be unable to satisfy a requirement The seller failed to fulfil his obligations under the contract.
- She failed to fulfil that promise.
- He worried that they would fail to fulfill their part of the bargain.
- The director failed to fulfil her duties.
- Employees who fail to fulfill contract requirements may be fired.
- The invention failed to fulfill the criteria of patentability.
- The term fail to has a very negative connotation and implies fault.