Right side
追 supplies the sound — zhuī shifting to chuí, a regular zh/ch retroflex alternation. The 'to chase' meaning has no semantic role; pure phonetic. The same phonetic stem produces
椎 chuí spine/vertebra and
锤 chuí hammer, all reading the same chuí — three different materials (wood, bone, metal) all named with the
追 phonetic for striking implements.