verb-intransitive. To grieve or protest loudly and bitterly; lament. See Synonyms at cry.verb-intransitive. To make a prolonged, high-pitched sound suggestive of a cry: The wind wailed through the trees. v. Archaic To lament over; bewail.n. A long, loud, high-pitched cry, as of grief or pain.n. A long, loud, high-pitched sound: the wail of a siren. n. A loud, bitter protest: A wail of misery went up when new parking restrictions were announced.