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|present participle||building up|
|past tense||built up|
|past participle||built up|
Don’t allow resentment to build up between you and your partner.
These exercises are good for building up leg strength.
Stevens played a key role in building up the company.
They’ve built him up to be something that he isn’t.
You need lots of fresh fruit to help build you up.
I don’t want to build up her hopes if he’s not coming back.
This is the British English definition of build up. View American English definition of build up.