a double-edged sword

Значение

something that has both good and bad effects

То, что приносит и пользу, и вред.

Примеры

1. 1Working from home is a double-edged sword: no commute, but you can feel lonely.
2. 2Fame can be a double-edged sword for young musicians.
3. 3Social media is a double-edged sword for small shops, bringing customers but also angry reviews.
4. 4The bonus scheme turned out to be a double-edged sword, since staff earned more but stopped helping each other.
5. 5For many students a part-time job is a double-edged sword, because it pays the bills but eats into study time.

Грамматика

Исчисляемое сочетание, часто после be или can be. double-edged пишется через дефис.