What is the meaning of Allege?

To state under oath, to plead.

To cite or quote an author or his work for or against.

To adduce (something) as a reason, excuse, support etc.

To make a claim as justification or proof; to make an assertion without proof.

(Can we verify this sense?) To lighten, diminish.

second-person singular present active imperative of allegō

Source: wiktionary.org