(bokmål) slå to fluer i ett smekk (to hit two flies in one slap) betyr engelsk

kill two birds with one stone▼(solve two problems at once)
verb
[UK: kɪl ˈtuː bɜːdz wɪð wʌn stəʊn] [US: ˈkɪl ˈtuː ˈbɝːdz wɪθ wʌn ˈstoʊn]