If you gain on someone or something that is moving in front of you, you gradually get closer to them.
The Mercedes began to gain on the van.
PHRASAL VERB : V P n
If you gain on someone or something that is moving in front of you, you gradually get closer to them.
The Mercedes began to gain on the van.
PHRASAL VERB : V P n
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006