名詞 button:

1. a round fastener sewn to shirts and coats etc to fit through buttonholes
2. an electrical switch operated by pressing
   同義詞：push button, push
3. any of various plant parts that resemble buttons
4. a round flat badge displaying information and suitable for pinning onto a garment
5. a female sexual organ homologous to the penis
   同義詞：clitoris, clit
6. a device that when pressed will release part of a mechanism
   同義詞：release
7. any artifact that resembles a button

動(dòng)詞 button:

1. provide with buttons
2. fasten with buttons

1. Will you stitch a button on this shirt?
   請(qǐng)你在這件襯衫上釘一顆鈕扣好嗎？
2. You may push this button to call the elevator.
   你可以按這個(gè)按鈕叫電梯。
3. My skirt buttons at the back.
   我的裙子是背后扣扣子的。
4. One of the buttons has come off my coat.
   我上衣上的一顆扣子掉了。

but.ton

n.（名詞）

A generally disk-shaped fastener used to join two parts of a garment by fitting through a buttonhole or loop.
鈕扣：通常為圓片狀的固著物，用于穿過扣眼或扣環(huán)將衣服的兩個(gè)部分連起來
Such an object used for decoration.
裝飾扣：用于裝飾的鈕扣
Any of various objects resembling a button, especially:
鈕扣似的東西：各種類似鈕扣的東西，特別指：
A push-button switch.
按鈕開關(guān)
The blunt tip of a fencing foil.
擊劍的鈍劍頭
A fused metal or glass globule.
金屬球，玻璃球：熔合的金屬或玻璃小球
Any of various knoblike structures of a plant or animal, especially:
扣形物：植物或動(dòng)物的各種球狀結(jié)構(gòu)，尤指：
An immature, unexpanded mushroom.
末成熟的，未張開的蘑菇
The tip of a rattlesnake`s rattle.
響尾蛇發(fā)聲器官的末端
A usually round flat badge that bears a design or printed information and is typically pinned to a garment:
圓形小徽章：通常為一種圓形扁平的徽章，上面有花紋或印制的信息，象征性地別在衣服上：
例句：
a campaign button.
軍功章

Informal The end of the chin, regarded as the point of impact for a punch.
【非正式用語】 頦尖：下巴的下端，被當(dāng)作拳擊的攻擊點(diǎn)
v.（動(dòng)詞）
but.toned,but.ton.ing,but.tons
v.tr.（及物動(dòng)詞）
To fasten with buttons:
用鈕扣扣緊：
例句：
buttoned his shirt; buttoned up her raincoat.
扣上襯衫鈕扣；把雨衣扣好

To decorate or furnish with buttons.
用鈕扣裝飾
Informal To close (the lips or mouth):
【非正式用語】 閉嘴：閉上（雙唇或嘴巴）：
例句：
Button your lip.
閉上嘴

v.intr.（不及物動(dòng)詞）
To be or be capable of being fastened with buttons:
扣上扣子：能用扣子扣住：
例句：
The blouse buttons up the back.
這件衣服從背后扣鈕扣

<習(xí)慣用語>on the button
Exactly; precisely.
準(zhǔn)確；確切
來源：
Middle English
中古英語
from Old French bouton
源自 古法語 bouton
from bouter [to thrust]
源自 bouter [插入]
[of Germanic origin] * see bhau-
[源于日耳曼語] *參見 bhau-

【引伸】
but.toner
n.（名詞）
but.tony
adj.（形容詞）