shí​yán'ér​féi

to break a promise

食言而肥 shí​yán'ér​féi
to break a promise
literally "to grow fat eating one's words"; to fail to live up to one's promises or be untrustworthy; used to describe someone who constantly goes back on their word

Frequency

Movie subtitles
0.060 per million appears in 0% of films
Written text
0.038 per million

Sources