What does "coast" mean?

Native speaker’s answer
Rebecca
When someone "coasts," it has a couple of meanings. The meaning here is to <not put enough effort into something>. He's not taking the dance class seriously. "To coast" can also mean to do something easily and well. Ex: He was coasting through the race and won! => easy and well Ex: Rachel coasted her way through university and got a distinction. => easy and well Ex: Jane is coasting in school and needs to work harder. => not putting in the effort Ex: He coasts along on his charm and has no motivation for aspirations. => not putting in the effort