Real Dictionary

clamp
countable noun: A clamp is a device that holds two things firmly together.
verb: To clamp something in a particular place means to put it or hold it there firmly and tightly.
verb: When you clamp one thing to another, you fasten the two things together with a clamp.

clamp in American English
noun: a device, usually of some rigid material, for strengthening or supporting objects or fastening them together

clamp in American English 1
any of various devices for clasping or fastening things together, or for bracing parts; esp., an appliance with two parts that can be brought together, usually by a screw, to grip something
to grip, fasten, or brace with or as with a clamp

clamp in American English 2
the sound of heavy footsteps
to tread heavily

clamp in British English 1
to fix or fasten with or as if with a clamp
noun: a mechanical device with movable jaws with which an object can be secured to a bench or with which two objects may be secured together

clamp in British English 2
noun: a mound formed out of a harvested root crop, covered with straw and earth to protect it from winter weather
verb: to enclose (a harvested root crop) in a mound