Webster's English Dictionary

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coast

1. coast \'ko-st\ \'ko-st-*l\ n [ME cost, fr. MF coste, fr. L costa rib, 
   side; akin to OSlav]kostibreve> bone obs  1: BORDER, FRONTIER  2: land near 
   the seashore : SEASHORE  3: a hill or slope suited to coasting; also : a 
   slide down a slope  (as on a sled) - coast.al aj
2. coast vt obs  1: to move along or past the side of : SKIRT  2: to sail 
   along the shore of  archaic  1a: to travel on land along a coast or along 
   or past the side of something  1b: to sail along the shore  2a: to slide, 
   run, or glide downhill by the force of gravity  2b: to move along without 
   or as if without further application of propulsi ve power (as by momentum 
   or gravity)