Definitions of coast:

• noun:   the area within view

  Example: "The coast is clear"

• noun:   a slope down which sleds may coast

  Example: "When it snowed they made a coast on the golf course"

• noun:   the shore of a sea or ocean
• noun:   the act of moving smoothly along a surface while remaining in contact with it

  Example: "The children lined up for a coast down the snowy slope"

• verb:   move effortlessly; by force of gravity
• name:  A surname (very rare: popularity rank in the U.S.: #30608)