phrasal
1. : to free from custody, contact, restraint, or check
2. : to free oneself from domination, control, restraint, inhibition, or influence
he cut loose from his domineering father
3. : to act, proceed, or perform with abandon or wildness
the rattled pitcher cut loose with a wild pitch
: celebrate or enjoy oneself with carefree abandon and lack of restraint
convention delegates cutting loose at night