dead center
n.
The point at the end of each stroke of a moving crank and connecting rod at which the two lie in the same straight line and the turning force applied by the connecting rod is zero. Also called dead point.

[TahlilGaran] American Dictionary ▲

dead center
the exact middle
I easily hit the target dead center.

[TahlilGaran] English Idioms Dictionary ▲

dead center
n. The exact middle.
The treasure was buried in the dead center of the island. Often used like an adverb.
The arrow hit the circle dead center.

[TahlilGaran] English Idioms Dictionary ▲