【喻】事情弄糟；失败（甩：脱落）。一唔垂意就会甩底。（一不小心就会弄糟。） 丢脸。当住咁多人面，你话是不是甩底啊！（当着那么多人，你说丢脸不丢脸！） 爽约；不守承诺。七点钟喺戏院门口见，唔见唔散，咪甩底啊。（七点钟在戏院门口见，不见不散，别失约啊。）

(phrasal verb) to stand someone up; not turning up for a date or appointment; to break a promise; to fail to so something as promised; to have a secret exposed; to mess up something; to have the base (usually of a container) falling off.