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We couldn't get cream, so we used yoghurt as a substitute.
a milk/sugar/meat substitute
a synthetic substitute for rubber
Rituals and superstitions may become a substitute for a religious life.
Of course a pet is a poor substitute for human companionship.
Feeling sorry for someone is no substitute for love.
This is the British English definition of substitute. View American English definition of substitute.
a part of an atom that moves around the nucleus (=centre) and has a negative electrical charge