pit somebody against something

Từ điển Oxford Advanced Learner 8th

ˈpit sb/sth against sth derived
to test sb or their strength, intelligence, etc. in a struggle or contest against sb/sth else
•Lawyers and accountants felt that they were being pitted against each other.
•a chance to pit your wits against the world champions (= in a test of your intelligence)
Main entry: ↑pit_derived