3–4 defense

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In American football, the 3–4 defense is a common defensive alignment consisting of three down linemen and four linebackers. It is called a "base defense" because it will readily switch to other defensive alignments (such as a nickel defense or a dime defense) as circumstances change.

Excerpt from the Wikipedia article “3–4 defense”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Recreated by User:Stannered, CC BY-SA 3.0, via Wikimedia Commons.