permission obtained from a court to take some action that, without such permission, would not be allowable. This permission in some instances may come before or after the expiration of the period in which the action was to be taken. For instance, a trustee may need "leave of court" in order to spend trust corpus for the support of the trust beneficiary; an attorney will need "leave of court" in order to file papers after the time allowed for filing the papers has elapsed.