Clev·is n. A piece of metal bent in the form of an oxbow, with the two ends perforated to receive a pin, used on the end of the tongue of a plow, wagen, etc., to attach it to a draft chain, whiffletree, etc.; -- called also clavel, clevy.
n : a coupler shaped like the letter U with holes through each
end so a bolt or pin can pass through the holes to
complete the coupling; used to attach a drawbar to a plow
or wagon or trailer etc.