preserve (someone's) anonymity

Translations
сохранить анонимность (кого-то)
The journalist promised to preserve the whistleblower's anonymity.
Журналист пообещал сохранить анонимность информатора.
Definitions
To keep someone's identity secret or undisclosed, ensuring that their name or personal information is not revealed to others.
Words
preserve

verb
сохранять
someone

pronoun
кто-то
s

article or possessive pronoun
чей-то
anonymity

noun
анонимность