The phrase "has a go" is commonly used to describe an attempt at something or taking a chance. Some antonyms for "has a go" could include refraining, avoiding, or abstaining. Other antonyms could include being inactive, showing apathy, disinterest, or indifference towards taking action. Another antonym for "has a go" could be hesitation, reluctance, or timidity. Depending on the context, opposites to "has a go" could range from not being willing to try to being completely passive and uninvolved. In general, antonyms for "has a go" represent the opposite of a proactive and determined attitude.