keep somebody on their toes

US /kiːp ˈsʌm.bə.di ɑn ðer toʊz/
UK /kiːp ˈsʌm.bə.di ɑn ðer toʊz/
"keep somebody on their toes" picture
1.

iemand scherp houden, iemand alert houden

to make someone stay active and concentrated

:
The challenging project really kept us on our toes.
Het uitdagende project hield ons echt scherp.
Our boss likes to keep us on our toes with unexpected tasks.
Onze baas houdt ervan om ons scherp te houden met onverwachte taken.