砕石 （サイセキ） crushed stone, macadam, crushing (rock)

砕岩機 （サイガンキ） rock crusher

破砕 （ハサイ） crushing (into pieces), smashing, cracking, breaking up

玉砕 （ギョクサイ） honourable defeat, honorable defeat, honourable death, honorable death, death without surrender, trying but being utterly beaten, being completely rejected when professing one's love

砕く （くだく） to break, to smash

砕ける （くだける） to break (into pieces), to be broken, to be smashed, to collapse, to crumble, to decline, to cool (e.g. enthusiasm), to dampen (e.g. one's will to fight), to become less formal, to throw off reserve, to become affable, to become easy to understand (e.g. a story), to be worried