To obstruct or prevent movement through or past something. The fallen tree blocked the road, causing a traffic jam.
To stop or impede the progress or completion of something. The new regulations could block the company's expansion plans.
To prevent someone from seeing or accessing something, especially on social media or digital platforms. She decided to block him on all her social media accounts after their argument.
To stop a ball or puck from entering the goal in sports. The goalkeeper managed to block the penalty shot, keeping the score tied.