What is False Allegation Of Child Sexual Abuse?

Legal Definition
A false allegation of child sexual abuse is an accusation that a person committed one or more acts of child sexual abuse when in reality there was no perpetration of abuse by the accused person as alleged. Such accusations can be brought by the alleged victim, or by another person on the alleged victim's behalf. Studies of child abuse allegations suggest that the overall rate of false accusation is under 10%. Of the allegations determined to be false, only a small portion originated with the child, the studies showed; most false allegations originated with an adult bringing the accusations on behalf of a child, and of those, a large majority occurred in the context of divorce and child-custody battles. Another possible motive is revenge by the person making the allegation against the accused person. There is also evidence that the UK (and formerly the New Zealand) systems of paying substantial compensation to alleged victims and their parents without requiring proof of the allegation, can provide a motive for making false allegations.
-- Wikipedia