like: con ác → →
der Alptraum ☊ 
cơn ác mộng ☊ 
☊ The avalanche forced its way down the mountain, crushing everything in its path. ☊ path ☊
Our dream holiday turned into a nightmare. ☊ turn (from sth) into sth ☊
raven ☊ con ác ☊ der Alptraum ☊ cơn ác mộng ☊ ☊