:a set of customs or laws that does not allow black people to do the same things or be in the same places as white people种族歧视;种族界限
Jackie Robinson broke American baseball's color line. [=he was the first black man to play professional baseball with white players]杰基·罗宾森打破了美国棒球界的种族界限。
: a set of societal or legal barriers that segregates people of color from white people (as by restricting social interaction or requiring separate facilities) and prevents people of color from exercising the same rights and accessing the same opportunities as white people—usually used with the
His father … had grown up in California with Jackie Robinson, who broke the color line in Major League Baseball. Maureen O'Donnell