Fail to keep up with the others (3)

I believe the answer is:
lag
(Other definitions for lag that I've seen before include "Drop behind" , "trail" , "Provide protection" , "Ex-convict" , "Cover pipes" .)
I believe the answer is:
lag
(Other definitions for lag that I've seen before include "Drop behind" , "trail" , "Provide protection" , "Ex-convict" , "Cover pipes" .)