opt in

== English == === Etymology === From opt + in. === Verb === opt in (third-person singular simple present opts in, present participle opting in, simple past and past participle opted in) To choose to participate in something ==== Antonyms ==== opt out ==== Translations ==== ==== See also ==== sit in === Anagrams === Pinto, Point, pinot, pinto, piton, point, potin