- a movable cover, hinged or unattached, as for a box, trunk, pot, etc.; top
- Informal a curb or restraint: to put a lid on illegal gambling
- Slang a cap, hat, etc.
- Slang a small package of marijuana, usually about an ounce
- Bot., loosely an operculum
Origin of lidMiddle English from Old English hlid (akin to German -lid in augenlid, eyelid) from base seen in Old English hlidan, to cover from Indo-European base an unverified form ?lei-, to lean