a double-edged sword = a double-edged weapon
a course of action or situation having both positive and negative effects
2000 - Investor - A rising pound is a double-edged sword when investing overseas.
RELATED IDIOMS :
at the double = on the double
at running speed
This modern generalized sense has developed from the mid 19th-century military use of double pace to mean twice the number of steps per minute of slow pace.
double or nothing
a gamble to decide whether a loss or debt should be doubled or cancelled
A British variant of double or nothing is double or quits.
a double-edged weapon :
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