Of a collar, able to be buttoned down to the shirt, as over a necktie. / (idiomatic) Serious; staid; businesslike. / (idiomatic) Conservative; conventional; unimaginative.

A shirt with a button-down collar

A button on a corset.

especially any of several flowering plants, of the genus Craspedia (but especially Craspedia globosa), native to Australia, having globes of yellow flowers.

Any of a line of preset buttons on a car radio used to select the station to be listened to; pressing one releases the others

A button on an alarm clock which, when pressed, silences the alarm temporarily, granting a few more minutes of sleep before the alarm sounds again.

(transitive) To fasten with a button or buttons. / (intransitive) To fasten all the buttons on a coat, or similar item of clothing, to keep warm.

(simile) Very cute.

plural of belly-button

plural of belly button