Question #127600. Asked by aussiesalute.
Last updated Jan 09 2017.
Originally posted Nov 03 2012 5:08 AM.
looney_tunes
Answer has 4 votes
Currently Best Answer
looney_tunes Moderator 19 year member
3319 replies
Answer has 4 votes.
Currently voted the best answer.
To flash can mean "to exhibit briefly"(transitive verb 4 at the link). To flash a gun means to give others a brief glimpse of the gun, so they are aware of its presence.
http://www.thefreedictionary.com/flash