Longman Dictionary of Contemporary English homepage
China

double-edged

 adjective
     
double-edged
1

a double-edged sword/weapon

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