How do you pronounce 交九?

Q: How do you pronounce 交九? A: gaau1 gau2, e.g.

交九 (gaau1 gau2) — meaning, pronunciation, examples

交九 (gaau1 gau2, jiāo jiǔ) — the coldest period of the year; three nine day periods after the winter solstice

交 (gaau1) — to hand over; to deliver; to pay (money); to turn over; to make friends; to int…
交叉 (gaau1 caa1) — a cross (as opposite to a tick)
交叉科學 (gaau1 caa1 fo1 hok6) — Interdisciplinary Sciences
交吉 (gaau1 gat1) — vacant possession
交回 (gaau1 wui4) — to return (an item to)
交學費 (gaau1 hok6 fai3) — pay school tuition fees