Sharp as a tack
Meaning: very intelligent, very smart, very clever
Example: He may be old in years, but he's still as sharp as a tack and knows what he's talking about.
Π‘Π΅ΡΠΈΠ°Π»Ρ ΠΈ ΡΠΈΠ»ΡΠΌΡ Π½Π° Π°Π½Π³Π»ΠΈΠΉΡΠΊΠΎΠΌ Ρ ΡΡΠ±ΡΠΈΡΡΠ°ΠΌΠΈ. +1 ΠΠ΅ΡΡΡ Π² ΠΏΠΎΠ΄Π°ΡΠΎΠΊ π
Example: He may be old in years, but he's still as sharp as a tack and knows what he's talking about.