What is Coast ?
Coast is (noun) 1. land by the sea After ten weeks at sea, Columbus saw the coast of America. The south coast is the warmest part of the country. Let’s drive down to the coast this weekend. from coast to coast from the sea on one side of a country to the sea on the other side He crossed the USA from coast to coast. 2. when the coast is clear when there is no longer any danger If the coast is clear, we can creep round the back of the house.(verb) 1. to ride a vehicle without using the engine or the pedals 2. (of a boat) to sail along a coast
source: Easier English, Student Dictionary Upper Intermediate Level