at each other's throats
US /æt iːtʃ ˈʌðərz θroʊts/
UK /æt iːtʃ ˈʌðərz θroʊts/

1.
estar a la greña, discutir acaloradamente
if two people are at each other's throats, they are arguing angrily
:
•
The two brothers are always at each other's throats.
Los dos hermanos siempre están a la greña.
•
They've been at each other's throats ever since the argument.
Han estado a la greña desde la discusión.