"Remettre les pendules à l’heure."
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“To put the clocks back on time.”
To get things clear.
“Il avait plaqué sa copine mais elle n’arrêtait pas de lui envoyer des textos. Il est retourné la voir pour remettre les pendules à l’heure.”
“He broke up with his girlfriend but she couldn’t stop sending him texts. He came to see her again to get it clear.”