allyoudaoicibaDictYouDict[all 词源字典]
all: [OE] Words related to all are found throughout the Germanic languages (German all, Dutch al, Old Norse allr, Gothic alls, for instance). They can probably all be traced back to a hypothetical Germanic ancestor *alnaz. Connections outside Germanic are not known, unless Lithuanian aliai ‘completely’ is a relative.
[all etymology, all origin, 英语词源]
allyoudaoicibaDictYouDict
Old English eall "all, every, entire," from Proto-Germanic *alnaz (cognates: Old Frisian, Old High German al, Old Norse allr, Gothic alls), with no certain connection outside Germanic.

Combinations with all meaning "wholly, without limit" were common in Old English (such as eall-halig "all-holy," eall-mihtig "all-mighty") and the method continued to form new compound words throughout the history of English. First record of all out "to one's full powers" is 1880. All-terrain vehicle first recorded 1968. All clear as a signal of "no danger" is recorded from 1902. All right, indicative of approval, is attested from 1953.