ˌBig ˈBrothers
a US organization to help boys, especially boys who do not have fathers or who come from families experiencing difficulties. Each boy has his own Big Brother, a man who meets him regularly to give advice, listen to his problems, play games, and be a role model. Big Brothers are volunteers (=people who work without being paid), and there is a similar organization for girls called Big Sisters.

[TahlilGaran] Dictionary of Contemporary English ▲