noun
crushed ice; chipped ice
Refers to ice that has been crushed or chipped into small pieces, commonly used in drinks or for cooling. The term is often associated with summer and traditional Japanese shaved ice (かき氷) but can refer to any crushed ice.
暑い日には、かち割りを入れた麦茶が最高だ。
On a hot day, barley tea with crushed ice is the best.
かち割りをグラスにたっぷり入れて、冷たいジュースを注いだ。
I filled the glass with plenty of crushed ice and poured cold juice over it.
かき氷 is shaved ice, typically served as a dessert with syrup, while かち割り is simply crushed or chipped ice, often used as a cooling agent in drinks.
氷 is the general word for ice, including ice cubes, blocks, or natural ice. かち割り specifically refers to ice that has been crushed or chipped.
Compound of かち (onomatopoeic or mimetic element suggesting hardness or cracking) + 割り (from 割る, 'to split, break'). The exact origin of かち is uncertain, but it likely imitates the sound of ice being cracked or crushed.