牢 lou⁴ {láo}

1. firm
2. sturdy
3. fold (for animals)
4. sacrifice
5. prison

牢房 lou⁴ fong² {láo fáng}

1. jail cell
2. prison cell

牢記〔-记〕 lou⁴ gei³ {láo jì}

1. to keep in mind
2. to remember

牢固 lou⁴ gu³ {láo gù}

1. firm
2. secure

牢友 lou⁴ jau² {láo yǒu}

1. inmate
2. cellmate

牢獄〔-狱〕 lou⁴ juk⁶ {láo yù}

prison

牢靠 lou⁴ kaau³ {láo kào}

1. firm and solid
2. robust
3. reliable

牢牢 lou⁴ lou⁴ {láo láo}

1. firmly
2. safely

牢籠〔-笼〕 lou⁴ lung⁴ {láo lóng}

1. cage
2. trap (e.g. basket, pit or snare for catching animals)
3. fig. bonds (of wrong ideas)
4. shackles (of past misconceptions)
5. to trap
6. to shackle

牢騷〔-骚〕 lou⁴ sou¹ {láo sāo}

1. discontent
2. complaint
3. to complain

牢子 lou⁴ zi² {láo zǐ}

jailer (old)

牢不可破 lou⁴ bat¹ ho² po³ {láo bù kě pò}

(proverb) something is very strong and unbreakable indissoluble; Or someone's belief is adamant.

牢獄之災〔-狱-灾〕 lou⁴ juk⁶ zi¹ zoi¹ {láo yù zhī zāi}

imprisonment

牢靠妥當〔---当〕 lou⁴ kaau³ to⁵ dong³ {láo kào tuǒ dàng}

1. reliable
2. solid and dependable