A device with pins that fits into a socket to connect electrical equipment to a power supply.

“I need an adapter because the plug on my laptop doesn't fit this outlet.”

An object used to fill or block a hole, often to prevent liquid from escaping.

“Don't forget to put the plug in the drain before you turn on the water.”

To mention or praise something publicly to help it succeed or sell.

“The actress was on the talk show to plug her new movie.”