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
Takondwa	tah-KON-dwah	Southern African, Chewa
Avraham	ah-vrah-HAHM (Jewish)	Hebrew, Biblical Hebrew
Cunningham	['kʌniəm]
Scales	[skeilz]
Kelly	KEL-ee	Irish, English
Sophos	-	Ancient Greek