a small disk, knob, or the like for sewing or otherwise attaching to an article, as of clothing, serving as a fastening when passed through a buttonhole or loop.
anything resembling a button, esp. in being small and round, as any of various candies, ornaments, tags, identification badges, reflectors, markers, etc.
a badge or emblem bearing a name, slogan, identifying figure, etc., for wear on the lapel, dress, etc.: campaign buttons.
any small knob or disk pressed to activate an electric circuit, release a spring, or otherwise operate or open a machine, small door, toy, etc.
a bud or other protuberant part of a plant.
a young or undeveloped mushroom.
any protuberant part of a fungus.
any of various small parts or structures resembling a button, as the rattle at the tip of the tail in a very young rattlesnake.
the point of the chin.
Also calleda fastener for a door, window, etc., having two arms and rotating on a pivot that is attached to the frame.
(in assaying) a small globule or lump of metal at the bottom of a crucible after fusion.
the protective, blunting knob fixed to the point of a foil.
crown (def. 19).
(in a graphical user interface) any of the small, labeled, button-shaped areas upon which the user can click, as with a mouse, to choose an option.
to be mentally competent, alert, and sane; have all one's wits: At 106 she still has all her buttons.
exactly as desired, expected, specified, etc.: The prediction for snow was right on the button.
—v.t.
to fasten with a button or buttons: She quickly buttoned her coat.
to insert (a button) in a buttonhole or loop: He buttoned the top button of his shirt.
to provide (something) with a button or buttons.
—v.i.
to be capable of being buttoned: This coat buttons, but that one zips.
Within a short time, everything on the submarine was buttoned up.
Also,button one's lip.to become or keep silent.
to fasten securely; close up:Within a short time, everything on the submarine was buttoned up.
to fasten fully or put on, esp. an outer garment:Button up before going out.
to complete successfully; finish:The report is all buttoned up.