Question #127600. Asked by aussiesalute.
Last updated Jan 09 2017.
looney_tunes
Answer has 4 votes
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looney_tunes Moderator 20 year member
3340 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.