A cucumber preserved in a solution, usually a brine or a vinegar syrup.

“A pickle goes well with a hamburger.”

(often in the plural) Any vegetable preserved in vinegar and consumed as relish.

The brine used for preserving food.

“This tub is filled with the pickle that we will put the small cucumbers into.”

To preserve food (or sometimes other things) in a salt, sugar or vinegar solution.

“These cucumbers pickle very well.”

To remove high-temperature scale and oxidation from metal with heated (often sulphuric) industrial acid.

“The crew will pickle the fittings in the morning.”

(in the Python programming language) To serialize.