There are various synonyms for the phrase "divide into halves". Some of them are split in half, halve, bisect, cut in half, divide equally, cleave in two, sever down the middle, and split down the middle. These synonyms are often used interchangeably depending on the contexts. For instance, "split in half" is commonly used for breaking an object or group of things into two equal halves, while "bisect" is often used to refer to the dividing of a shape or object into two equal parts, usually with a line or plane. These synonyms for divide into halves can be very useful in expressing oneself in different ways and avoiding repetition in writing and speaking.