1 [usually + adverb/preposition]
if a car or bicycle coasts, it moves without any effort from you or any power from the engine
coast down/around/along etc
Bev coasted downhill on her bicycle.
to not try very hard to do something well - used to show disapproval:
Janey's teacher says she's just coasting at school.
to be successful at something without much effort:
They scored three goals in the first half and from then on United were coasting.
to sail along the coast while staying close to land