overplay your hand
US /ˌoʊvərˈpleɪ jʊər hænd/
UK /ˌoʊvərˈpleɪ jʊər hænd/

1.
exagerar, ir longe demais
to spoil a strong position by overdoing something or being too confident
:
•
He tried to demand too much and ended up overplaying his hand.
Ele tentou exigir demais e acabou exagerando.
•
The politician might overplay his hand by making such extreme promises.
O político pode exagerar ao fazer promessas tão extremas.