Joke, or choke (3)
I believe the answer is:
gag
I believe this is a double definition.
'joke' is the first definition.
(a gag is a joke or witticism)
'choke' is the second definition.
(I know that choke can be written as gag)
(Other definitions for gag that I've seen before include "Muzzle in palindrome form" , "Shut up" , "Restriction; joke" , "Make quiet" , "Funny" .)