rule of thumb

noun phrase

1

: a method of procedure based on experience and common sense

2

: a general principle regarded as roughly correct but not intended to be scientifically accurate

Examples of rule of thumb in a Sentence

Recent Examples on the Web

This is generally the rule of thumb for this time of year, and there hasn’t been anything particularly abnormal about this summer, Bonnette said. — Brayden Garcia, Fort Worth Star-Telegram, 24 Aug. 2026

These two things are related in possibly smaller cartridge choice than the old rule of thumb or the old idea of what a bear-defense firearm should be. — Alex Robinson, Outdoor Life, 20 Aug. 2026

In the past, the rule of thumb was that young starters would not add more than 30 innings to their workloads from one season to the next. — Peter Sblendorio, New York Daily News, 18 Aug. 2026

Sooner rather than later is a good rule of thumb when trying to rebook. — Eve Chen, USA Today, 18 Aug. 2026

Word History

First Known Use

circa 1658, in the meaning defined at sense 1

Rhymes for rule of thumb

• abomasum
• become
• checksum
• humdrum
• income
• outcome
• pisum
• succumb
• therefrom
• wherefrom
• bum
• chum

Kids Definition

rule of thumb

1

: a method based on experience and common sense

2

: a general principle that is roughly correct