1
- the part of the land near the sea; the edge of the land海岸; 海滨：
the west coast of Africa
非洲西海岸
they sailed further up the coast
他们继续沿着海岸向北航行
as modifier the coast road.海滨公路。
1.1
the Coast
N. Amer. the Pacific coast of North America〈北美〉北美太平洋海岸。
2
- a run or movement in or on a vehicle without use of power（车辆的）滑行。
1
- no obj., with adverbial of direction(of a person or vehicle) move easily without using power（人, 车辆）滑行：
they were coasting down a long hill.
他们沿着长长的山坡往下滑行。
1.1
- no obj. act or make progress without making much effort不费力地做; 不费力地进步：
Colchester coasted to victory.
柯彻斯特轻易取胜。
2
- 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）：
as adj. coasting a West Country coasting ketch.英国西南部沿海航行的双桅纵帆船。
短语
the coast is clear
- there is no danger of being observed or caught平安无事, 安全无险。
词源
Middle English （in the sense 'side of the body'）, from Old French coste (noun), costeier (verb), from Latin costa 'rib, flank, side'. Sense 1 arose from the phrase coast of the sea 'side of the sea'.