The phrase "sits the fence" refers to a person who remains neutral or undecided on a particular issue. The antonyms for this phrase would be decisive, committed, and opinionated. A decisive person is someone who makes a prompt and firm decision without hesitation. A committed person is someone who is dedicated and loyal to a particular cause or belief. An opinionated person is someone who holds strong views and is not afraid to express them. By being decisive, committed, and opinionated, individuals can avoid the negativity associated with sitting the fence, including indecisiveness, indifference, and being labeled as wishy-washy.