a double-edged knife

Translations
обоюдоострый нож
Using a double-edged knife can be dangerous if someone is not careful.
Использование обоюдоострого ножа может быть опасным, если кто-то неосторожен.
Definitions
A double-edged knife is a type of blade that has two sharp edges, allowing it to cut in both directions. Metaphorically, it refers to a situation or action that has both positive and negative consequences.
Words
a

article or possessive pronoun
один
double edged

adjective
обоюдоострый
knife

noun
нож