DTB is an acronym for "down to business," which means ready to start or get serious about the task at hand. Some synonyms for DTB include "get down to business," "start working," "get serious," "focus," "concentrate," "begin operation," and "knuckle down." These words convey a sense of urgency and determination, indicating that it's time to put distractions aside and focus solely on the job that needs to be done. No matter which synonym you use, the ultimate goal is the same: to get in the right mindset and tackle the task with all of your effort and energy.