Lid meaning : A thin skin membrane that covers and moves over an eye. The top or cover of a container. A cap or hat. One ounce of cannabis. A bodyboard or bodyboarder. A motorcyclist's crash helmet. In amateur radio, an incompetent operator. A hermetically sealed top piece on a microchip such as the integrated heat spreader on a CPU. A restraint or control, as when "putting a lid" on something. To put a lid on (something).