(idiomatic) To appear to be no older chronologically than a certain age.

plural of nine-day wonder

The Qixi festival.

(US) A day designated for fathers and their daughters to spend time together and celebrate their relationship; often the second Sunday of October.

(idiomatic) It takes a long time to create something complicated or impressive.

(Australia, historical, slang) An Australian soldier serving in World War I, especially a volunteer.

(advertising) A method of advertising research measuring the percentage of people who remember seeing an advertisement the day after it was shown on television.

Completely naked.

(US, idiomatic, predicative) Too late and too feeble to achieve the desired effect.

(US, idiomatic) Adverbial use of the adjectival form.