to slide on a sled down a snowy or icy hillside or incline.
8.
to descend a hill or the like, as on a bicycle, without using pedals.
9.
to continue to move or advance after effort has ceased; keep going on acquired momentum: We cut off the car engine and coasted for a while.
10.
to advance or proceed with little or no effort, especially owing to one's actual or former assets, as wealth, position, or name, or those of another: The actor coasted to stardom on his father's name.
11.
to sail along, or call at the various ports of, a coast.
to cause to move along under acquired momentum: to coast a rocket around the sun.
14.
to proceed along or near the coast of.
15.
Obsolete. to keep alongside of (a person moving).
16.
Obsolete. to go by the side or border of.
Idiom
17.
the coast is clear, no danger or impediment exists; no persons are in the path or vicinity: The boys waited until the coast was clear before climbing over the wall.
Origin: 1325–75; (noun) Middle English cost(e) < Anglo-French, Middle French < Latin costa rib, side, wall; (v.) Middle English cost(e)yen, costen < Anglo-French costeier,Old French costoier, derivative of the noun
Synonyms 1. strand, seaside, littoral. See shore1.
c.1125, from O.Fr. coste "shore, coast," from L. costa "a rib," developing a sense in M.L. of the shore as the "side" of the land. Fr. also used this word for "hillside, slope," which led to verb use of "sled downhill," first attested 1775 in Amer.Eng.