keep someone at arm's length
US /kiːp ˈsʌm.wʌn æt ˈɑːrmz ˈleŋθ/
UK /kiːp ˈsʌm.wʌn æt ˈɑːrmz ˈleŋθ/

1.
tenere qualcuno a distanza, mantenere le distanze
to avoid being very friendly with someone
:
•
She always keeps everyone at arm's length, even her closest colleagues.
Lei tiene sempre tutti a distanza, anche i suoi colleghi più stretti.
•
After their argument, he decided to keep her at arm's length.
Dopo il loro litigio, decise di tenerla a distanza.