bail up verb5 •(Australia) To apply a bail to (a cow); to trap or corner. •(Australia, New-Zealand) To stop (someone) to talk to them; to buttonhole.I'm late because Debbie bailed me up on the phone. •(Australia) To corner (someone); to hold (someone) under threat of violence; for dogs to hold people or animals at bay. •(Australia) To rob (someone).They bailed me up for fifty bucks. •For rocks, clay, etc. to build up around a drill. formsbailed up · bailing up · bails up