Said of things that are very different, though possibly superficially alike.
Definition source: English Wiktionary via Wiktextract
Usage: New-Zealand, UK, idiomatic, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: apples and oranges, day and night, night and day
Antonyms: none provided
Attested in variant form since 1393. The surface of some cheeses, particularly unaged ones, resembles the surface of chalk: white, crumbling, but in substance cheese is much softer than chalk. It is interesting to note that lime chalk and cottage cheese forms a glue-like material used in the restoration of ancient half-timbered houses, perhaps suggesting an alternative original meaning.