pierre de touche

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touchstone, assay stone, touchstone, decisive test, criterion
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/pjɛʁ də tuʃ/
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A surface or test that reveals the true value of something.

Examples

  • L'épreuve du terrain est la pierre de touche d'une réforme.
    The test in the field is the touchstone of a reform.
  • Une pierre de touche permet de comparer les traces laissées par l'or.
    A touchstone lets one compare the marks left by gold.
  • La pratique reste la pierre de touche de cette théorie.
    Practice remains the touchstone of this theory.
  • La capacité d'écoute est la pierre de touche d'un bon médiateur.
    The ability to listen is the decisive criterion for a good mediator.
  • Cette décision sera une pierre de touche pour la nouvelle équipe.
    This decision will be a crucial test for the new team.

Similar words

épreuve décisive
touchau
test déterminant
critère décisif

Meanings

Gold-testing stone

metalwork
technical
A dark stone on which a metal leaves a streak that can be used to assess its quality.

Examples

  • Le bijoutier a frotté la bague sur la pierre de touche.
    The jeweller rubbed the ring on the touchstone.
  • Une pierre de touche permet de comparer les traces laissées par l'or.
    A touchstone lets one compare the marks left by gold.
  • Il a posé plusieurs pierres de touche près des flacons d'acide.
    He placed several touchstones beside the acid bottles.
  • La trace sur la pierre de touche a aidé à estimer le titre du métal.
    The mark on the touchstone helped estimate the metal's purity.
  • L'orfèvre garde sa pierre de touche dans un étui.
    The goldsmith keeps his touchstone in a case.

Similar words

Decisive criterion

judgment
formal
A decisive test or standard that reveals someone's or something's real worth.

Examples

  • La crise fut la pierre de touche de sa loyauté.
    The crisis was the test of his loyalty.
  • La pratique reste la pierre de touche de cette théorie.
    Practice remains the touchstone of this theory.
  • Cette décision sera une pierre de touche pour la nouvelle équipe.
    This decision will be a crucial test for the new team.
  • L'épreuve du terrain est la pierre de touche d'une réforme.
    The test in the field is the touchstone of a reform.
  • La capacité d'écoute est la pierre de touche d'un bon médiateur.
    The ability to listen is the decisive criterion for a good mediator.

Similar words

Etymology

The literal stone was used to assay gold by its streak; its testing role gave rise to the figurative sense of a decisive criterion.

FAQ

What is a pierre de touche?

A gold-testing stone or, figuratively, a decisive test.

Is the stone real?

Yes, jewellers use it to assess metal.

What is its figurative meaning?

A criterion that reveals true worth.

Can a crisis be a pierre de touche?

Yes, if it tests someone's qualities.

What is the plural?

Pierres de touche.

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