Be down to somebody Definition 1 of 3Pro Tip 1/3Decision Power Used when someone has the final authority to decide on something important. Whether we go on the trip is down to my parents. Pro Tip 2/3Imminent Decision Highlights that a decision or action is expected very soon. It’s down to you to choose the winning design by tomorrow. Pro Tip 3/3Personal Responsibility Emphasizes someone’s unique role or duty in a particular situation. Fixing this mess is down to the last person who used the lab.