cleavage
US /ˈkliː.vɪdʒ/
UK /ˈkliː.vɪdʒ/

1.
scollatura, clivaggio
the hollow between a woman's breasts, especially as exposed by a low-cut garment.
:
•
Her dress showed a lot of cleavage.
Il suo vestito mostrava molta scollatura.
2.
scissione, divisione, frattura
a division or schism, especially a split between two opposing sides.
:
•
The political party suffered a deep cleavage over the new policy.
Il partito politico ha subito una profonda scissione sulla nuova politica.