<p><strong>Verb</strong></p><ul><li>(Used without object)<ul><li>To work, one with another; cooperate, as on a literary work: They collaborated on a novel.</li><li>To cooperate with an enemy nation, especially with an enemy occupying one's country: He collaborated with the Nazis during World War II.</li></ul></li><li><strong>Synonyms</strong>:<ul><li>Abet</li><li>Assist</li><li>Join</li><li>Collude</li></ul></li></ul>