(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.
Definitions (粵典–words.hk)
動詞
同其他人約定咗之後無兑現承諾 to break one's word or promise; literally: to lose the bottom part
佢上次約我嗰陣甩底,今次我唔信佢嘞。
佢上次约我𠮶阵甩底,今次我唔信佢嘞。
keoi5 soeng6 ci3 joek3 ngo5 go2 zan6 lat1 dai2, gam1 ci3 ngo5 m4 seon3 keoi5 laak3. He made an appointment with me and didn't keep it last time, so this time I won't trust him.
The snack shop on my block thought they would get free exposure by sponsoring a student union event and providing several hundred wings, but then the students broke their promise and did not show up to pick up the wings. What a waste!