Definition of under-read in English:

under-read

verb

[NO OBJECT]
  • (of a gauge or dial) show a reading lower than the true one.

    • ‘I was informed that as an advanced driver I should demonstrate I have the skill to use speed to improve my safety, given that the police will allow eight per cent over the limit, plus I have an inherent under-reading on my speedo.’

Pronunciation

under-read

/ʌndəˈriːd/