(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)
draw a bead on (third-person singular simple present draws a bead on, present participle drawing a bead on, simple past and past participle drew a bead on)
- (transitive, slang) To aim a gun at.
- Synonym: take a bead on
1892, Mark Twain, “Act II, Scene I”, in Meisterschaft: In Three Acts, page 188:
(As George gets fairly into the following, Gretchen draws a bead on him, and lets drive at the close, but the gun snaps.)