deadly combination

Translations
смертельная комбинация
The storm and high tide were a deadly combination.
Шторм и высокий прилив были смертельной комбинацией.
Definitions
A 'deadly combination' refers to a situation or a mix of elements that can lead to very harmful, dangerous, or lethal outcomes. It often implies that the combination of factors is particularly potent in causing negative consequences.
Words
deadly

adjective
смертоносный
combination

noun
сочетание