词典释义：
the part of the land near the sea; the edge of the land
海岸；海滨
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the west coast of Africa 非洲西海岸
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they sailed further up the coast 他们继续沿着海岸向北航行
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[as modifier]
the coast road .海滨公路。
(
〈北 美〉 北美太平洋海岸。
a run or movement in or on a vehicle without use of power
（车辆的）滑行。
[no obj., with adverbial of direction](of a person or vehicle)move easily without using power
（人，车辆）滑行
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they were coasting down a long hill .他们沿着长长的山坡往下滑行。
[no obj.]act or make progress without making much effort
不费力地做；不费力地进步
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Colchester coasted to victory .柯彻斯特轻易取胜。
[no obj., with adverbial of direction]sail along the coast, especially in order to carry cargo
沿海岸航行（尤指运货）
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[as
adj. coasting ]a West Country coasting ketch .英国西南部沿海航行的双桅纵帆船。
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the coast is clear there is no danger of being observed or caught 平安无事，安全无险
"Middle English （in the sense ‘side of the body’）, from Old French
