in half
in half {adv. phr.}
1. Into two equal parts.
The ticket taker at the football game tore the tickets in half.
Mother cut the apple in half so each child could have an equal share.
Syn.: IN TWO.
2. To half the size before; to one half as big.
As a punishment, Father cut Bob's allowance in half.
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Source: A Dictionary of American Idioms