Any major progress; such as a great innovation or discovery that overcomes a significant obstacle. Example: Albert Einstein is credited with making some of the greatest breakthroughs in modern physics.
The penetration of the opposition defence
The penetration of a separating wall or the remaining distance to an adjacent hollow (a crosscut in mining) or between two parts of a tunnel build from both ends; knockthrough.
Characterized by major progress or overcoming some obstacle. Example: a breakthrough technological advance
All clues having "BREAKTHROUGH"
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