breakthroughs

noun

1. 1

   An advance through and past enemy lines.

2. 2

   Any major progress; such as a great innovation or discovery that overcomes a significant obstacle.

   “Albert Einstein is credited with making some of the greatest breakthroughs in modern physics.”

3. 3

   The penetration of the opposition defence

4. 4

   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.