to make new and important discoveries Scientists think they are beginning to break through in the fight against cancer. related noun breakthrough
- 1to make a way through something using force Demonstrators broke through the police cordon. There was a police cordon around the site but the demonstrators still broke through.
- 2(of the sun or moon) to appear from behind clouds The sun broke through at last in the afternoon. At last the moon broke through the clouds and they could see their way.