don't even think about itUsually used as a strong warning or refusal. The verb can change with the subject: «Je n'y pense même pas» means “I don't even think about it,” while «N'y pensez même pas !» is the formal or plural command “Don't even think about it!” «Y» means “about it” here.
FR: N'y pense même pas, c'est beaucoup trop dangereux.
EN: Don't even think about it; it's far too dangerous.