Cause I know if they get up
I won't get a chance to let off another punch

from Eminem (Ft. Dr. Dre) – Say What You Say Lyrics on Rap Genius

Meaning

Em won’t give no one else a chance to strike back so he’ll kill them at the first opportunity.

To help improve the quality of the lyrics, visit “Say What You Say” by Eminem (Ft. Dr. Dre) Lyrics and leave a suggestion at the bottom of the page