1mortise (slot cut into wood to receive a tenon)
24th earthly branch: 5–7 a.m., 2nd solar month (6th March–4th April), Year of the Rabbit
3ancient Chinese compass point: 90° (east)
4(coll.) to concentrate one's strength (variant of 鉚|铆) (鉚|铆 · to fasten with a rivet)