1. To lighten, diminish.

Verb (etymology 2)

  1. To state under oath, to plead.
  2. To cite or quote an author or his work for or against.
  3. To adduce (something) as a reason, excuse, support etc.
  4. To make a claim as justification or proof; to make an assertion without proof.

The above text is a snippet from Wiktionary: allege
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