cowboys and Indians

Từ điển Oxford Advanced Learner 8th

cowboys and Indians [cowboys and Indians] BrE NAmE noun [U]
a children’s game in which some children pretend to be ↑cowboys and others pretend to be Indians (Native Americans). They have imaginary fights, sometimes wearing special clothes, based on what they have seen in ↑westerns
•The kids were playing cowboys and Indians in the back garden.