Collins COBUILD Advanced Learner's English Dictionary - call on

or call upon 1. If you call on someone to do something or call upon them to do it, you say publicly that you want them to do it. One of Kenya’s leading churchmen has called on the government to resign... PHRASAL VERB: V P n to-inf 2. If you call on someone or call upon someone, you pay them a short visit. Sofia was intending to call on Miss Kitts. PHRASAL VERB: V P n