well thumbed
US /ˌwel ˈθʌmd/
UK /ˌwel ˈθʌmd/

1.
molto usato, logoro
having been read or handled a lot and consequently soiled or damaged
:
•
His favorite book was old and well thumbed.
Il suo libro preferito era vecchio e molto usato.
•
The dictionary on the shelf was clearly well thumbed.
Il dizionario sullo scaffale era chiaramente molto consultato.