In the context of reaching, "over" is a preposition that can be used to describe a position directly above or across a certain point or object without making contact. It can also commonly depict a movement or extent across a place from one end or side to another. This context can also refer to extending throughout a particular area or period of time. Furthermore, it may describe a situation of having successfully dealt with or completed something, as in getting "over" a challenge or obstacle.

1. An over-confident person reaches beyond their actual abilities, which may lead to their downfall. 2. The teenager tried to prove his bravery by jumping over the fence, reaching the other side to capture the flag. 3. The enthusiastic student extended over the standard curriculum, reaching new topics to satiate his curiosity. 4. The climber was pushing his limits, over-reaching his physical strength to conquer the mountain peak. 5. The ambitious entrepreneur worked hard, reaching over her initial business aspirations and streamlining an even bigger enterprise.

Fun Fact: The word "over" in the context of "reaching" can actually refer to a fascinating phenomenon in physics known as "quantum tunneling". This term describes when particles achieve the seemingly impossible feat of reaching or getting over an energy barrier that should technically be insurmountable based on classical physics. Essentially, these particles appear to 'teleport' over the barrier. It is a crucial principle in the function of many electronic devices and a perfect epitome of the intriguing world of quantum mechanics!