put an animal, a bird, etc. out of its miseryidiomPart ofmiseryput an animal, a bird, etc. out of its miseryput an animal, a bird, etc. out of its misery — idiomidiom1. To kill a creature that is suffering from an incurable illness or injury.1.idiomDefinitionTo kill a creature that is suffering from an incurable illness or injury.ExampleThe vet put the injured cat out of its misery.Should we put the sick bird out of its misery?