How do you pronounce 錮?

Q: How do you pronounce 錮? A: gu3, e.g.

錮 (gu3) — meaning, pronunciation, examples

錮 (gu3, gù) — obstinate disease; to restrain; to stop; to fill up cracks in molten metal; to confine; to imprison; to hold in custody

錮囚鋒 (gu3 cau4 fung1) — occluded front (meteorology)
錮漏鍋 (gu3 lau6 wo1) — tinker; artisan who fixes leaky pots
估 (gu2) — estimate; guess; presume
估吓 (gu2 haa5) — take a guess
估唔到 (gu2 m4 dou2) — cannot guess; used to describe a person who is hard to predict or unpredictable…
估計 (gu2 gai3) — estimation; guess