English idiom

rule of thumb

Register · Neutral CEFR B2

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Figurative meaning

a rough, practical guideline based on experience rather than exact measurement

Why this phrase?

Possibly from measuring with a thumb; means a rough practical guide.

Example

“As a rule of thumb, drink eight glasses of water a day.”

Dictionary details

Tags

rules

Expressions connected by reviewed component words or topic tags.

fall in line

to obey or accept the rules and expectations set by a group or authority

golden rule

the most important rule or principle to follow

out of the question

completely impossible or not permitted

sign on the dotted line

to commit yourself formally by signing an agreement

take it or leave it

accept an offer exactly as presented or reject it entirely

under lock and key

kept securely locked away so that access or escape is prevented

Source methodology

Meanings, register, CEFR, and examples come from the reviewed dictionary record. Expression notes may describe a reviewed present-day word picture or a background note; they are not presented as verified etymology.

External links

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