The difference between Common-or-garden and Garden variety
When used as adjectives, common-or-garden means ordinary, standard, whereas garden variety means ordinary, common, or unexceptional.
check bellow for the other definitions of Common-or-garden and Garden variety
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Common-or-garden as an adjective (chiefly British):
ordinary, standard.
Examples:
"It's just a common-or-garden fridge but it works fine."
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Garden variety as an adjective (idiomatic):
Ordinary, common, or unexceptional.
Examples:
"I can usually recover from a garden variety cold with rest and fluids."