Be decided by, dependent on, or up to. For example, The choice of restaurant lies with you. Starting about 1300 this phrase meant "to have sexual intercourse with," a usage that is now obsolete. [Late 1800s]
1. To be decided by, dependent on, or up to someone or something: Most of the country's wealth still lies with the elite. The fault lies with the negligent parents, not with the children. The prisoner's fate now lies with the governor.
2. Archaic To have sexual intercourse with someone.