amenazar
threaten
menace
threat
+
-ar
verb suffix
Amenazar means to threaten and can be thought of as menace0 (threat0) + -ar1 (verb suffix1).
verb
  1. threaten
    To threaten or warn of potential harm or danger
    El ladrón amenazó al cajero con un arma. // The thief threatened the cashier with a weapon.