The word "shutoff" has several antonyms that represent its opposite meaning, such as "open," "start," "begin," "initiate," and "activate." While "shutoff" implies an action of closing, stopping, or ending something, its antonyms denote a process of starting, enabling, or initializing it. For instance, if a shutoff valve restricts water flow, its antonym, "open," suggests allowing water to flow freely. Similarly, if one turns off a machine, its antonym, "start," implies beginning its operation. Therefore, the antonyms of "shutoff" not only define its opposite meaning but also offer an array of possibilities to initiate a process or action.