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下穴 (したあな) — pilot hole; rough hole; prepared hole
下穴
pilot hole
ねじ下穴 (径) ねじしたあなけい
hole (size) before threading
穴 「あな」「けつ」「めど」
hole; opening; orifice; perforation
穴一 あないち
chuck-farthing (game of throwing coins in a hole); pitch-farthing
一穴 いっけつ
one hole
点穴 てんけつ
pressure points (e.g. for application of moxa)