airtight case

Translations
безупречное дело
The lawyer built an airtight case against the defendant.
Адвокат построил безупречное дело против обвиняемого.
Definitions
An airtight case refers to a situation or argument that is so well-structured and supported by evidence that it cannot be easily challenged or refuted.
Words
airtight

adjective
неопровержимый
case

noun
случай