What is "to catch at"

Catch \Catch\, v. i.

1. To attain possession. [Obs.]

   Have is have, however men do catch.
   --Shak.

2. To be held or impeded by entanglement or a light obstruction; as, a kite catches in a tree; a door catches so as not to open.

3. To take hold; as, the bolt does not catch.

4. To spread by, or as by, infecting; to communicate.

   Does the sedition catch from man to man?
   --Addison.

   To catch at, to attempt to seize; to be eager to get or use. ``[To] catch at all opportunities of subverting the state.''
   --Addison.

   To catch up with, to come up with; to overtake.