v.1. To put someone or something in a snug spot: The babysitter tucked the children up soundly in bed. I tucked up the horses in the barn.
2. To put something in an out-of-the-way, snug place: The cabin was tucked up among the pines. I tucked my hair up under a wool cap.
3. To draw up some body part into a tuck position: The diver tucked up her legs for a somersault. The gymnast tucked his knees up to his chest during the dismount.
4. To assume a tuck position: The flight attendants advised the passengers to tuck up for a rough landing.