Definition

Reliable, trustworthy, or of high quality; something or someone you can depend on.

Example Usage

That's a solid plan—I'm in.

Origin

From literal meaning of 'solid' as firm and stable; metaphorically applied to people and ideas in 20th century slang

Fun Fact

Used across generations as an all-purpose compliment, from Gen X to Gen Z.

Source: Definition backfill (hailey)

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