食言而肥

lit. to grow fat eating one's words (idiom) / fig. not to live up to one's promises

and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)

words / speech / to say / to talk

to eat / food / animal feed / eclipse

to feed (a person or animal)

fat / fertile / loose-fitting or large / to fertilize / to become rich by illegal means / fertilizer / manure

lit. to eat one's words / to break a promise / to go back on one's word / to renege / unsworn testimony

to break one's promise