yes, 同以小千和文青， 觉得这里字面上“coast”有 "slide"的意思

来源: 于 2011-05-15 15:13:34 [旧帖] [给我悄悄话] 本文已被阅读：次

引申为 “take it easy" or "relax"

so, it means "When you begin to take it easy， you'll go downgrade, or you won't move up"