Webster's English Dictionary

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cleat

1. cleat \'kle-t\ n [ME clete wedge, fr. (assumed) OE cle-at; akin to MHG 
   klo-]z lump - more at CLOUT 1a: a wedge-shaped piece fastened to or 
   projecting from something and servi ng as a support or check 1b: a wooden 
   or metal fitting usu. with two projecting horns around which a  rope may be 
   made fast 2a: a strip fastened across something to give strength or hold in 
   position  2b: a projecting piece (as on the bottom of a shoe) that 
   furnishes a grip 
2. cleat vt 1: to secure to or by a cleat  2: to provide with a cleat