not if one can help it
Only without one's agreement, only if one cannot prevent it. For example, Is he taking a second job?—Not if his wife can help it, or He's not riding on the back of that motorcycle, not if I can help it. This idiom uses help in the sense of “prevent” or “cause to be otherwise.” [Mid-1800s]
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How to use not if one can help it in a sentence
That strategy has been used in some cases to help determine GMO policy.
Added to drinking water at concentrations of around one part per million, fluoride ions stick to dental plaque.
In his view, a writer has only one duty: to be present in his books.
Yet this, in the end, is a book from which one emerges sad, gloomy, disenchanted, at least if we agree to take it seriously.
The fear of violence should not determine what one does or does not say.
Practise gliding in the form of inflection, or slide, from one extreme of pitch to another.Expressive Voice Culture|Jessie Eldridge Southwick
And to tell the truth, she couldn't help wishing he could see, so he could make the game livelier.The Tale of Grandfather Mole|Arthur Scott Bailey
He alludes to it as one of their evil customs and used by them to produce insensibility.
There was a rumor that Alessandro and his father had both died; but no one knew anything certainly.Ramona|Helen Hunt Jackson
Truth is a torch, but one of enormous size; so that we slink past it in rather a blinking fashion for fear it should burn us.Pearls of Thought|Maturin M. Ballou