Put in service is a phrase that is used to describe the process of making something available for USE. It can refer to the introduction of a new product or service, the activation of a device, or the deployment of personnel or equipment. In this case, the crossword solutions for the term put in service are USE, ACT, and DEPLOY. The term USE refers to the utilization of something, such as a product or service. ACT is used to describe the process of activating something, such as a device or system. Finally, DEPLOY is used to describe the process of sending personnel or equipment to a specific location.