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

1.
hanya omong kosong, besar mulut tapi tidak ada 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 membual tentang rencananya, tapi dia hanya omong kosong.
•
Don't listen to her promises; she's all mouth and no trousers.
Jangan dengarkan janjinya; dia hanya omong kosong.