Once a use and ever a custom.
Once a use and ever a custom.
Meaning in plain English
Doing something once can create an expectation that it will continue. The saying warns about a precedent becoming customary, without proving that a single occasion permanently binds anyone to repeat it.
Example
A club opens late for one special event and tells visitors that the extra hour is an exception, rather than allowing the notice to imply a permanent timetable change.
Deeper explanation and when to use it
Once a use turns an individual action into the beginning of a pattern. Ever a custom exaggerates how readily people may treat that first occasion as the new normal. A useful reading clarifies whether an arrangement is temporary or ongoing, especially where others may rely on it. One favour or exception need not become a permanent obligation, and a continuing practice can be reviewed. The proverb differs from calling custom second nature: its emphasis is the expectation created by a precedent rather than an individual’s familiar routine. Clear communication can prevent an isolated choice from silently acquiring a larger meaning.
When to use it
Use it when a one-off arrangement might be mistaken for an ongoing practice.
Keep in mind
A precedent does not remove consent or prevent a later review of the arrangement.
Edsverb editorial interpretation · agent reviewed · 2026-10-05. This explains the saying; it does not establish its historical origin.
- Source
- A Dictionary of English Proverbs and Proverbial Phrases
Entry 373 · Custom
Read the original context ↗ - Attribution confidence
- traditional · historical anthology
Preserved as printed; independently unverified. - Historical coordinate
- Undated
No reliable date supplied by the collection. - Rights & edition
- Public domain (United States)
Translations and rights may differ elsewhere.
Provenance and licences ↗