【喻】暂且依靠一件（个）尚能差强人意的事物（人），同时去寻找更好的。喺度做住先，骑牛揾马，揾倒好工嘛跳啰！（暂且在这儿干着，骑着牛去找马，找到好的工作就跳槽嘛！）

(phrase) to buy time for something, e.g. a job, while waiting for a better opportunity to come along (literally "to ride an ox looking for a horse")