Start on Definition 1 of 3Pro Tip 1/3Task Initiation Used when expressing the start of a focused activity or effort on something specific. I need to start on my report soon. Pro Tip 2/3Active Beginnings Emphasizes an active engagement with tasks, as opposed to passive contemplation or planning. She decided to start on the project right away. Pro Tip 3/3First Steps Indicates taking the first actions towards a larger goal or process. Tomorrow, we'll start on the first steps of our journey.