double-edged

double-edged
adj
1 (of a knife, etc) having two edges （指刀等）双刃的.
2 (fig 比喻) (of a remark) having two possible meanings; ambiguous （指言语）模棱两可的, 含糊其辞的
    a ,double-edged `argument, `compliment, re`ply, etc 语意含混的论据、 恭维话、 答覆等.

牛津英汉双解词典