Definitions of work on. verb. to exert effort in order to do, make, or perform something. Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.Definitions of work on. verb. to exert effort in order to do, make, or perform something.