Meaning of “pit sb/sth against sb/sth” - Learner’s Dictionary

pit sb/sth against sb/sth

phrasal verb with pit us uk /pɪt/ verb present participle pitting, past tense and past participle pitted

to make someone or something compete against someone or something else:

Teams of athletes were pitted against each other.

(Definition of “pit sb/sth against sb/sth” from the Cambridge Learner’s Dictionary © Cambridge University Press)