up the mid*dle
1. This is when the ball is hit in the area by second base. This also refers to the imaginary line that starts at home plate and goes up through the pitcher’s mound, second base and into centerfield.
In addition, when a team a team says that they want to build a strong defense or team up the middle, they are referring to the second baseman, shortstop, catcher and center fielder.
1. Pujols sends the 2-2 pitch up the middle for a leadoff single.
2. The team has said that their main mission this offseason is to address their needs up the middle.
Sports The Term Is Used