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double-edged
1 something that seems to be good, but that can have a bad effect : 
Being famous is often a double-edged sword.
a double-edged sword/weapon
Being famous is often a double-edged sword.2 having two different parts : a double-edged attack on global warming
a double-edged attack on global warming3 a double-edged remark has two possible meanings, one of which is not very nice : It sounded like a double-edged comment.
It sounded like a double-edged comment.4PMW with two cutting edges : a double-edged knife
a double-edged knife
