further

• adv.さらに; さらに; さらに遠く
• adj.さらに；さらに深く
• vt.促進する; 育成する; 高める

farの比較級として使う。

further

further: [OE] Etymologically, further is simply a comparative form of forth, and originally meant nothing more than simply ‘more forward’. Its more metaphorical senses, ‘in addition’ and ‘to a greater extent’, are secondary developments. It was formed in the pre-historic Germanic period, and so has relatives in other Germanic languages, such as German vorder. Its verbal use is apparently equally ancient.
=> forth

further (adv.)

Old English fureor, foreor "to a more advanced position, forward, onward, beyond, more distant; farther away; later, afterward; to a greater degree or extent, in addition; moreover," etymologically representing either "forth-er" or "fore-ther." The former would be from fureum (see forth) + comparative suffix *-eron-, *-uron- (compare inner, outer).

Alternative etymology (Watkins) traces it to Proto-Germanic *furthera-, from PIE *pr-tero- (source also of Greek proteros "former"), representing the root *per- (1) "forward, through" (see per) + comparative suffix also found in after, other. Senses of "in addition, to a greater extent" are later metaphoric developments.

It replaced or absorbed farrer, ferrer as comparative of far (itself a comparative but no longer felt as one). Farrer itself displaced Old English fierr in this job; farrer survived until 17c., then was reduced to dialect by rival farther. "The primary sense of further, farther is 'more forward, more onward'; but this sense is practically coincident with that of the comparative degree of far, where the latter word refers to real or attributed motion in some particular direction." [OED]

further (v.)

Old English fyreran, fyrerian "to impel, urge on; advance, promote, benefit;" see further (adv.). Compare Middle Low German vorderen, Old High German furdiran, German f?rdern, probably from their respective adjectives via the notion in phrases such as Old English don fureor "to promote." Related: Furthered; furthering. After the further/farther split, this sense also continued in a shadow verb farther (v.), attested from 16c. but apparently dying out 19c.

further (adj.)

Old English furera "further, greater, superior," probably a prehistoric derivative of further (adv.). Compare Old Frisian fordera, German vorder "that is before another." In early Middle English it also meant "earlier, former, previous;" a great-grandfather was a furtur ealdefader (12c.), and a previous wife was referred to legally as a forther wife.

1. The room was quiet ; no one voluntered any further information.

部屋は静かで、より多くの情報を積極的に提供する人はいません。

2.His style could scarcely be further removed from that of his predecessor.

彼のスタイルはほとんど彼の先輩と同じだ。

3.Now we live further away from the city centre.今、私たちは都心からもっと遠くに住んでいます。

4.As the baby suckles,a further supply of milk is generated.

赤ちゃんが吸うと、より多くの乳が流れ出ます。

5.He went even further in his speech to the conference.

彼は大会発言の中でさらに詳しく述べた。