差し支える
さしつかえる · sashitsukaeru · JLPT N1 · verb-ichidan
to interfere
差 — 垂 (drooping) + 工 (work/tool)
Originally depicted a hand reaching down to grasp grain stalks of uneven length, suggesting discrepancy or unevenness. From this came the meaning 'difference' or 'to differ.' The reading chā specifically carries the sense of disparity, while other readings developed meanings like 'to dispatch' (chāi) and 'poor/lacking' (chà).
支 — hand 又 holding a branch 十
Originally a pictograph showing a hand (又) holding a branch broken from a tree, depicting the act of supporting or propping something up. From this came meanings like 'branch,' 'to support,' and 'to pay out.' It also serves as a phonetic component in characters like 枝 (branch) and 技 (skill).