at (some time) sharp

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.
See also: sharp
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

at some time sharp

exactly at the time named. You must be here at noon sharp. The plane is expected to arrive at seven forty-five sharp.
See also: sharp, time
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also: