fine tuning
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Small changes to something to improve it or make it work better are called fine-tuning.
We are still fine tuning our new website and appreciate your patience.
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Blow the whistle
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If you report an illegal or socially-harmful activity to the authorities, and give information about those responsible for it, you blow the whistle, or you are a whistle-blower.
He refused to blow the whistle on his boss for fear of losing his job.
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Clean as a whistle
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Something as clean as a whistle is extremely clean.
This can also mean that a person's criminal record is clean.
Bob spent the afternoon washing and shining his car until it was as clean as a whistle.
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Below the belt
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An action or remark described as below the belt is considered to be unfair or cruel.
Politicians sometimes use personal information to hit their rivals below the belt.
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Tighten your belt
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If you need to tighten your belt, you must spend less money or be careful how you spend it because there is less available.
Another bill? I'll have to tighten my belt this month!
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