Glossary
Anti-eco
In one line: The round played against a team that did not buy: you have the better guns, they do not.
What it means
When the enemy team is on an eco (saving their money), you are playing the anti-eco. You have rifles and armor, they have pistols or cheap guns. The danger is not the long-range fight, which you win almost every time, but the close-range one: a Shorty or a Judge behind a corner kills anyone.
So you play it calmly: keep your distance, clear one angle at a time, use your rifles' range and never hand them a gun. Losing an anti-eco hurts a lot, because the enemies pick up your weapons and the economy evens out.
An example
You won the pistol round and the enemies are on an eco in round two. Instead of rushing into the site, your team holds the long lines through mid and lets them come to you. Anyone trying to close the distance with a pistol gets picked from range.