if an organization or person is a force to be reckoned with, they are very powerful.
The Scottish team's performance last month shows that they are once again a force to be reckoned with.
be a force to be reckoned with
To be strong, powerful, or difficult to defeat. They say the young boxer is a force to be reckoned with, so I'm betting he'll win the match tonight.The attorney may look petite and meek, but she's a force to be reckoned with in the courtroom.