keep tabs on
US /kiːp tæbz ɑːn/
UK /kiːp tæbz ɑːn/

1.
in de gaten houden, bijhouden
to monitor or keep track of someone or something
:
•
It's important to keep tabs on your spending.
Het is belangrijk om je uitgaven in de gaten te houden.
•
The police are keeping tabs on the suspect.
De politie houdt de verdachte in de gaten.