There are several synonyms that can be used for the phrase "doeth takeoff". The most common one is "conducts a takeoff", which is often used in the field of aviation or construction to describe the process of estimating the cost and materials needed for a project. Another synonym for "doeth takeoff" is "performs a departure", which could be used in the context of a plane taking off. Additionally, one might use the term "initiates a launch", which is often used in the technology industry when describing the release of a new product or service. Whatever synonym you choose, it's important to convey the idea of starting or beginning a particular action or process.