sign in編輯正在努力提供更完整的內容，建議 20 分鐘後再回來看看sign insign in — 動詞動詞1. to write your name on a list or document to show that you have arrived1.動詞釋義簽到to write your name on a list or document to show that you have arrived例句Please sign in at the front desk when you arrive.