"Flip of coin" is a common phrase used when referring to a random or chance outcome. However, there are a variety of synonyms that can be used to describe this action, including "toss of a coin," "throw of a dice," "spin of a roulette wheel," and "draw of a straw." Each of these phrases can be used to convey the same idea of a random or chance outcome, but with a slightly different connotation or context. For example, "spin of a roulette wheel" may imply a more formal or structured setting, while "toss of a coin" may suggest a more casual or friendly decision-making process.