Menace, intimidate (8)
I believe the answer is:
threaten
I believe this is a double definition.
'menace' is the first definition.
(I know that menace can be written as threaten)
'intimidate' is the second definition.
(intimidate can mean to scare or threaten)
(Other definitions for threaten that I've seen before include "Look likely to" , "Be menacing" , "'Menace, intimidate (8)'" , "Warn of violence" , "Utter menaces" .)