clamp down on
US /klæmp daʊn ɑːn/
UK /klæmp daʊn ɑːn/

1.
reprimere, stringere le viti su
to become more strict about something, or to try to stop something bad from happening
:
•
The police are clamping down on illegal parking.
La polizia sta reprimendo il parcheggio illegale.
•
The government plans to clamp down on tax evasion.
Il governo intende reprimere l'evasione fiscale.