And all you other cats throwing shots at Jigga
You only get half a bar - fuck y'all niggas

from Jay Z – Takeover Lyrics on Rap Genius

Meaning

A fantastic ending: it dismisses all the other folks insulting Jay, not even deigning to mention them by name. The final insult lasts two beats, or half a bar of music

This was shot at a few rappers mainly Jadakiss and the LOX whom Roc-A-Fella had beef with around the same time. This beef involved the R. Kelly Fiesta remix in which Jada and Jay Z had separate features on different versions of the song

This last line also (perhaps purposefully) legitimizes Jay’s two primary opponents in the song as worthy adversaries. By using multiple verses to address Prodigy and Nas, he acknowledges that they are worth his time to attack even as he destroys them.

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