at the stroke of (some specific time)
Exactly at a specific time, especially the very beginning of the hour. The store is opening its doors at the stroke of midnight for the Black Friday sale. If you're not home at the stroke of 11, you're grounded!
on the stroke of (some specific time)
Exactly at a specific time, especially the very beginning of the hour. The store is opening its doors on the stroke of midnight for the Black Friday sale. If you're not home on the stroke of 11, you're grounded!
bricks shy of a load
Mentally impaired, either unintelligent or merely eccentric. For example, He may be handsome but he's not too bright-a few bricks shy of a load. This term, transferring a light load to lightweight mental capacity, is usually preceded by either a few or a specific number such as two . [Slang; 1960s]