Mock, tease (5)
I believe the answer is:
taunt
I believe this is a double definition.
'mock' is the first definition.
(taunting is a kind of mocking)
'tease' is the second definition.
(I know that tease can be written as taunt)
(Other definitions for taunt that I've seen before include "element of teasing" , "Insult" , "Mocking remark" , "Gibe" , "Wounding jibe" .)