be all mouth and no trousers
US /bi ɔl maʊθ ænd noʊ ˈtraʊzərz/
UK /bi ɔl maʊθ ænd noʊ ˈtraʊzərz/

1.
hanya cakap kosong, cakap besar tapi tiada tindakan
to talk a lot about what you are going to do but fail to actually do it
:
•
He's always boasting about his plans, but he's all mouth and no trousers.
Dia selalu berbangga tentang rancangannya, tetapi dia hanya cakap kosong.
•
Don't listen to her promises; she's all mouth and no trousers.
Jangan dengar janjinya; dia hanya cakap kosong.