Rule of thumb

Definitions

general guideline
A broadly applicable principle or standard that is used as a basis for making judgments or decisions
approximate measurement
An estimation or approximation that is not exact or precise, but is considered to be generally accurate
basic knowledge or skill
A fundamental understanding or ability that is essential for success in a certain area or field

Examples of Rule of thumb

The rule of thumb when cooking pasta is to add salt to the boiling water before adding the noodles. This will enhance the flavor of the pasta.

The phrase "rule of thumb" refers to a general principle or guideline that is based on common sense or practical experience. In this example, the rule of thumb for cooking pasta is to add salt to the water before adding the noodles. This is a simple and effective way to add flavor to the pasta.
When deciding on a career path, it's a good rule of thumb to consider your strengths and weaknesses. This will help you choose a career that is a good fit for your skills and abilities.

In this example, the rule of thumb for making a career decision is to consider your strengths and weaknesses. This is a practical and common-sense approach to choosing a career, as it allows you to select a job that matches your skills and abilities.
If you're not sure whether to wear a jacket or a sweater, a good rule of thumb is to check the weather forecast. This will help you dress appropriately for the conditions.

In this example, the rule of thumb for deciding whether to wear a jacket or a sweater is to check the weather forecast. This is a practical and logical approach to dressing appropriately, as it allows you to prepare for the weather conditions.
When giving directions, it's a good rule of thumb to use landmarks or recognizable features to help the person find their way. This will make it easier for them to follow your instructions.

In this example, the rule of thumb for giving directions is to use landmarks or recognizable features. This is a practical and effective way to help someone find their way, as it allows them to follow your instructions using familiar landmarks.
When cooking with wine, it's a good rule of thumb to use a dry white wine, as it won't overpower the flavors of the dish.

In this example, the rule of thumb for cooking with wine is to use a dry white wine. This is a practical and effective way to use wine in cooking, as it won't overpower the flavors of the dish.

Conclusion

The idiom "rule of thumb" is a commonly used expression that refers to a general guideline or principle that is used as a basis for making decisions or judgments. It can also refer to an approximate measurement or estimation that is not exact, but is considered to be generally accurate. Additionally, it can be used to describe a fundamental understanding or basic knowledge that is essential for success in a particular area or field.

This idiom is often used in a figurative sense, as it is not meant to be taken literally. It is a way of expressing a concept or idea in a concise and relatable manner. The use of the word "thumb" in the idiom is thought to come from the practice of using one's thumb as a rough measurement for things like distances or quantities.

Origin of "Rule of thumb"

The origin of the idiom "rule of thumb" is debated, but the most commonly accepted explanation is that it comes from an old English law that allowed men to beat their wives with a stick, as long as the stick was no wider than their thumb. This law, though not actually enforced, was used as a general guideline or rule for domestic violence.

However, there is no concrete evidence to support this origin, and some experts argue that it may have originated from various other sources, such as carpentry or cooking. Regardless of its exact origin, the idiom has been in use since the 17th century and has evolved to take on multiple meanings over time. Today, it is a widely recognized and commonly used expression in the English language.