chase (someone) down

Translations
разыскивать (кого-то)
The detective had to chase the suspect down to get more information.
Детективу пришлось разыскивать подозреваемого, чтобы получить больше информации.
Definitions
To pursue someone in order to catch or confront them, often involving running or moving quickly after the person.
Words
chase

verb
преследовать
someone

pronoun
кого то
down

adverb
вниз