Contain
'contain' is the definition.
(I know that contain can be written as curb)
This is all the clue.
(Other definitions for curb that I've seen before include "Strap used to restrain horse" , "Bridle" , "Rein in" , "[LIMITATION]" , "Muzzle" .)
'contain' is the definition.
(I know that contain is a more specific form of the action include)
This is the entire clue.
(Other definitions for include that I've seen before include "Count in along with others" , "Comprehend" , "Feature" , "Take in as part of unit" , "Cover" .)