Real Dictionary

lay up
If someone is laid up with an illness, the illness makes it necessary for them to stay in bed.

lay up in American English
to put away for future use; store up
to store for future use; hoard

lay up in British English
to store or reserve for future use

lay-up in American English
noun: a shot with one hand from a point close to the basket, in which a player shoots the ball toward the basket, often off the backboard