angleyoudaoicibaDictYouDict[angle 词源字典]
angle: There have been two distinct words angle in English. The older is now encountered virtually only in its derivatives, angler and angling, but until the early 19th century an angle was a ‘fishing hook’ (or, by extension, ‘fishing tackle’). It entered the language in the Old English period, and was based on Germanic *angg- (source also of German angel ‘fishing tackle’).

An earlier form of the word appears to have been applied by its former inhabitants to a fishhook-shaped area of Schleswig, in the Jutland peninsula; now Angeln, they called it Angul, and so they themselves came to be referred to as Angles. They brought their words with them to England, of course, and so both the country and the language, English, now contain a reminiscence of their fishhooks. Angle in the sense of a ‘figure formed by two intersecting lines’ entered the language in the 14th century (Chaucer is its first recorded user).

It came from Latin angulus ‘corner’, either directly or via French angle. The Latin word was originally a diminutive of *angus, which is related to other words that contain the notion of ‘bending’, such as Greek ágkūra (ultimate source of English anchor) and English ankle. They all go back to Indo-European *angg- ‘bent’, and it has been speculated that the fishhook angle, with its temptingly bent shape, may derive from the same source.

=> english; anchor, ankle[angle etymology, angle origin, 英语词源]
angle (v.1)youdaoicibaDictYouDict
"to fish with a hook," mid-15c., from Old English angel (n.) "angle, hook, fishhook," related to anga "hook," from PIE *ang-/*ank- "to bend" (see angle (n.)). Compare Old English angul, Old Norse öngull, Old High German angul, German Angel "fishhook." Figurative sense is recorded from 1580s.
It is but a sory lyfe and an yuell to stand anglynge all day to catche a fewe fisshes. [John Palsgrave, 1530]
Related: Angled; angling.
angle (n.)youdaoicibaDictYouDict
"space between intersecting lines," late 14c., from Old French angle "angle, corner," and directly from Latin angulus "an angle, corner," a diminutive form from PIE root *ang-/*ank- "to bend" (cognates: Greek ankylos "bent, crooked," Latin ang(u)ere "to compress in a bend, fold, strangle;" Old Church Slavonic aglu "corner;" Lithuanian anka "loop;" Sanskrit ankah "hook, bent," angam "limb;" Old English ancleo "ankle;" Old High German ango "hook"). Angle bracket is 1875 in carpentry; 1956 in typography.
member of a Teutonic tribe, Old English, from Latin Angli "the Angles," literally "people of Angul" (Old Norse Öngull), a region in what is now Holstein, said to be so-called for its hook-like shape (see angle (n.)). People from the tribe there founded the kingdoms of Mercia, Northumbia, and East Anglia in 5c. Britain. Their name, rather than that of the Saxons or Jutes, may have become the common one for the whole group of Germanic tribes because their dialect was the first committed to writing.
angle (v.2)youdaoicibaDictYouDict
"to move at an angle, to move diagonally or obliquely," 1741, from angle (n.). Related: Angled; angling.