student asking question

What does "rule of thumb" mean?

teacher

Native speaker’s answer

Rebecca

"Rule of thumb" is a commonly used expression that means a generally accepted rule, guideline, or principle for something. Ex: When picking out a watermelon, the general rule of thumb is to look for one with a large yellow patch. These are sweeter and have less seeds. Ex: As my rule of thumb, I never hold work meetings on Monday mornings.

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