The phrase "doeth double duty" refers to accomplishing two tasks with a single effort. Many synonyms can be used to describe this concept, including multi-tasking, double-functioning, dual-purpose, and two-in-one. Other phrases that convey the same meaning are "kill two birds with one stone," "hit two targets with one arrow," and "solve two problems at once." Such phrases and synonyms are useful in situations where efficiency and productivity are vital, as they highlight utilizing resources to produce maximum results. Therefore, incorporating "doeth double duty" and its synonyms in everyday language can help individuals accomplish more tasks effectively in a shorter amount of time.