English · Idiom Attested

solid as a rock

In real, traceable use. Part of the curated seed collection; community review is coming.

Sense 1

Both English Tiếng Việt

Meaning · English

Extremely thick and heavy, so as to make it impossible to move.

Nghĩa · Tiếng Việt

Quá dày và nặng để di chuyển

Machine-translated — suggest a fix

Where it’s used: Used American English

We're not going to be able to break down this door: it's solid as a rock.

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Both English Tiếng Việt

Meaning · English

Very reliable and dependable

Nghĩa · Tiếng Việt

Rất đáng tin cậy và ổn định

Machine-translated — suggest a fix

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

What does “solid as a rock” mean?

Extremely thick and heavy, so as to make it impossible to move.

Is “solid as a rock” formal or informal?

No register label has been reviewed yet — treat it as neutral and check the usage notes above.