draw a bead on

verb3

1. •
   (US, slang) To aim a gun at.

   • (As George gets fairly into the following, Gretchen draws a bead on him, and lets drive at the close, but the gun snaps.) — 1892
2. •
   (US, slang) To take aim at.
3. •
   (US, slang) to cast one's eyes on.