blade

来自PIE *bhel, 膨胀，生长，繁茂，同blow. 原指生长的叶子，叶片，后指刀片。

blade

blade: [OE] The primary sense of blade appears to be ‘leaf’ (as in ‘blades of grass’, and German blatt ‘leaf’). This points back to the ultimate source of the word, the Germanic stem *bhlō-, from which English also gets bloom, blossom, and the now archaic blow ‘come into flower’. However, the earliest sense recorded for Old English blæd was the metaphorical ‘flattened, leaflike part’, as of an oar, spade, etc. The specific application to the sharp, cutting part of a sword or knife developed in the 14th century.
=> bloom, blossom, blow

blade (n.)

Old English blæd "a leaf," but also "a leaf-like part" (of spade, oar, etc.), from Proto-Germanic *bladaz (cognates: Old Frisian bled "leaf," German Blatt, Old Saxon, Danish, Dutch blad, Old Norse blað), from PIE *bhle-to-, suffixed form (past participle) of *bhel- (3) "to thrive, bloom," possibly identical with *bhel- (2) "to blow, swell" (see bole). Extended in Middle English to shoulders (c. 1300) and swords (early 14c.). The modern use in reference to grass may be a Middle English revival, by influence of Old French bled "corn, wheat" (11c., perhaps from Germanic). The cognate in German, Blatt, is the general word for "leaf;" Laub is used collectively as "foliage." Old Norse blað was used of herbs and plants, lauf in reference to trees. This might have been the original distinction in Old English, too. Of men from 1590s; in later use often a reference to 18c. gallants, but the original exact sense, and thus signification, is uncertain.

1. A blade guard is fitted to protect the operator.

为保证操作人员的人身安全安装了桨叶保护罩。

2. A sharp blade is likely to nick the skin and draw blood.

锋利的刀刃可能会划伤皮肤，导致出血。

3. The soil sticks to the blade and blocks the plough.

土粘在犁铧上，卡住了犁。

4. To forge a blade takes great skill.

锻造刀刃需要很高超的技巧。

5. a blade of grass

一片草叶