noun

• (obsolete) The side or edge of something.
  "And the Coaſt towards which the lines KL and VX are drawn, may be call’d the Coaſt of unuſual Refraction."
• (obsolete) A region of land; a district or country.
  "Then Herod perceavynge that he was moocked off the wyse men, was excedynge wroth, and sent forth and slue all the chyldren that were in bethleem, and in all the costes thereof […]"
• (obsolete) A region of the air or heavens.
  "the learned Merlin, well could tell, / Vnder what coast of heauen the man did dwell […]"

verb

• (intransitive) To glide along without adding energy; to allow a vehicle to continue moving forward after disengaging the engine or ceasing to apply motive power.
  "When I ran out of gas, fortunately I managed to coast into a nearby gas station."
• (intransitive, nautical) To sail along a coast.
  "The Ancients coasted only in their Navigations."
• (intransitive, figurative) To make a minimal effort; to continue to do something in a routine way, without initiative or effort.
  "Yet the truth is that City would probably have been coasting by that point if the referee, Michael Oliver, had not turned down three separate penalties, at least two of which could be accurately described as certainties."
• (intransitive, obsolete) To draw near to; to approach; to keep near, or by the side of.
  "Anon she hears them chant it lustily, / And all in haste she coasteth to the cry."