• vt. 衬托；阻止，挡开；挫败；贴箔于
• n. 箔，金属薄片；衬托，烘托；叶形片
• abbr. 面向文件的翻译语言（file-Oriented interpretive language）
• n. (Foil)人名；(英)福伊尔

来自拉丁语folia, 叶子，词源同foliage. 用来指箔纸。

来自拉丁语fullo, 踩，特指洗衣，浣纱，词源同defile, full(漂洗衣物)。引申词义挫败。

foil

foil: English has three separate words foil. The oldest, ‘thwart’ [13], originally meant ‘trample’. It probably comes via Anglo-Norman *fuler from Vulgar Latin *fullāre, a derivative of Latin fullō ‘person who cleans and bulks out cloth, originally by treading’ (whence English fuller [OE]). Foil ‘metallic paper’ [14] comes via Old French from Latin folium ‘leaf’ (source also of English foliage [15] and folio [16]).

It originally meant ‘leaf’ in English too, but that usage died out in the 15th century. The modern notion of ‘one that enhances another by contrast’ comes from the practice of backing a gem with metal foil to increase its brilliancy, (Latin folium, incidentally, goes back to an Indo-European *bhel-, an extended form of which, *bhlō-, produced English blade, bloom, blossom, and flower.) The source of foil ‘sword’ [16] is not known, although the semantic development of blade from ‘leaf’ to ‘cutting part’ suggests the possibility that a similar process took place in the case of foil ‘leaf’.
=> fuller; blade, bloom, blossom, flower, foliage

foil (v.1)

c. 1300, foilen "to spoil a trace or scent by running over it" (more commonly defoilen), irregularly from Old French foler, fuler "trample on, injure, maim; ill-treat, deceive, get the better of" (13c., Modern French fouler), from Vulgar Latin *fullare "to clean cloth" (by treading on it), from Latin fullo "one who cleans cloth, a fuller," which is of unknown origin. Compare full (v.).

Hence, "to overthrow, defeat" (1540s; as a noun in this sense from late 15c.); "frustrate the efforts of" (1560s). Related: Foiled; foiling. Foiled again! as a cry of defeat and dismay is from at least 1847.

foil (n.)

"very thin sheet of metal," early 14c., foile, from Old French foil, fueill, fueille "leaf; foliage; sheet of paper; sheet of metal" (12c., Modern French fueille), from Latin folia, plural (mistaken for fem. singular) of folium "leaf" (see folio).

The sense of "one who enhances another by contrast" (1580s) is from the practice of backing a gem with metal foil to make it shine more brilliantly. The meaning "light sword used in fencing" (1590s) could be from this sense, or from foil (v.). The sense of "metallic food wrap" is from 1897.

foil (v.2)

"apply foil to," 1610s, from foil (n.1).

1. He thought of her serenity as a foil for his intemperance.

在他看来，她的平静反衬出了他的放纵。

来自柯林斯例句

2. Wrap the foil over the fish.

用箔纸把鱼包起来。

来自柯林斯例句

3. Cover the chicken loosely with foil.

用锡箔把鸡肉松松地盖起来。

来自《权威词典》

4. The chocolates are individually wrapped in gold foil.

巧克力用金箔纸一颗颗独立包装。

来自《权威词典》

5. An ugly woman serves as a foil to a pretty girl.

一个丑女人可以将美丽的姑娘反衬得更加漂亮.

来自《现代汉英综合大词典》