step out on

• • [美国俚语](在爱情上)不忠实于(某人)
  • [美国俚语](在爱情上)不忠实于(某人)：

    They knew they were stepping out on each other.

    他们俩人都知道对方对自己不忠实。

    No one told him that she stepped out on him.

    没人告诉他，她对他不忠贞。