at (some time) sharp

At an exact time, with the emphasis that one must not be late. We need to leave for the airport at 8 AM sharp tomorrow morning. Please be here at 6:30 sharp.

Common Names:

Name	Pronounced	Usage
Monserrat	moon-sə-RAHT	Catalan
Salim	sah-LEEM	Arabic
Abdulah	-	Bosnian
Kieran	KEER-awn, KEE-ar-awn	Irish
Dunja	DOO-nyah (Serbian, Croatian)	Serbian, Croatian, Slovene
Kwaku	-	Western African, Akan