Old English fyr, from Proto-Germanic *fuir (cf. Old Saxon and Old Frisian fiur, Old Norse fürr, Middle Dutch and Dutch vuur, Old High German fiur, German Feuer), from PIE *perjos, from root *paewr- (cf. Armenian hur "fire, torch," Czech pyr "hot ashes," Greek pyr, Umbrian pir, Sanskrit pu, Hittite pahhur "fire").
Current spelling is attested as early as 1200, but did not fully displace Middle English fier (preserved in fiery) until c.1600.
PIE apparently had two roots for fire: *paewr- and *egni- (cf. Latin ignis). The former was "inanimate," referring to fire as a substance, and the latter was "animate," referring to it as a living force (see water).
Fire applied in English to passions, feelings, from mid-14c. Meaning "action of guns, etc." is from 1580s. Firecracker is American English coinage for what is in England just cracker, but the U.S. word distinguishes it from the word meaning "biscuit." Fire-engine attested from 1680s. The figurative expression play with fire "risk disaster" is from 1887; phrase where's the fire? "what's the hurry?" first recorded 1924.
c.1200, furen, figurative, "arouse, excite;" literal sense of "set fire to" is from late 14c., from fire (n.). The Old English verb fyrian "to supply with fire" apparently did not survive into Middle English.
The sense of "sack, dismiss" is first recorded 1885 in American English (earlier "throw (someone) out" of some place, 1871), probably from a play on the two meanings of discharge: "to dismiss from a position," and "to fire a gun," fire in the second sense being from "set fire to gunpowder," attested from 1520s. Of bricks, pottery, etc., from 1660s. Related: Fired; firing. Fired up "angry" is from 1824. Firing squad is attested from 1904.
v. fired, fir·ing, fires
To generate an electrical impulse. Used of a neuron.
(1.) For sacred purposes. The sacrifices were consumed by fire (Gen. 8:20). The ever-burning fire on the altar was first kindled from heaven (Lev. 6:9, 13; 9:24), and afterwards rekindled at the dedication of Solomon's temple (2 Chr. 7:1, 3). The expressions "fire from heaven" and "fire of the Lord" generally denote lightning, but sometimes also the fire of the altar was so called (Ex. 29:18; Lev. 1:9; 2:3; 3:5, 9). Fire for a sacred purpose obtained otherwise than from the altar was called "strange fire" (Lev. 10:1, 2; Num. 3:4). The victims slain for sin offerings were afterwards consumed by fire outside the camp (Lev. 4:12, 21; 6:30; 16:27; Heb. 13:11). (2.) For domestic purposes, such as baking, cooking, warmth, etc. (Jer. 36:22; Mark 14:54; John 18:18). But on Sabbath no fire for any domestic purpose was to be kindled (Ex. 35:3; Num. 15:32-36). (3.) Punishment of death by fire was inflicted on such as were guilty of certain forms of unchastity and incest (Lev. 20:14; 21:9). The burning of captives in war was not unknown among the Jews (2 Sam. 12:31; Jer. 29:22). The bodies of infamous persons who were executed were also sometimes burned (Josh. 7:25; 2 Kings 23:16). (4.) In war, fire was used in the destruction of cities, as Jericho (Josh. 6:24), Ai (8:19), Hazor (11:11), Laish (Judg. 18:27), etc. The war-chariots of the Canaanites were burnt (Josh. 11:6, 9, 13). The Israelites burned the images (2 Kings 10:26; R.V., "pillars") of the house of Baal. These objects of worship seem to have been of the nature of obelisks, and were sometimes evidently made of wood. Torches were sometimes carried by the soldiers in battle (Judg. 7:16). (5.) Figuratively, fire is a symbol of Jehovah's presence and the instrument of his power (Ex. 14:19; Num. 11:1, 3; Judg. 13:20; 1 Kings 18:38; 2 Kings 1:10, 12; 2:11; Isa. 6:4; Ezek. 1:4; Rev. 1:14, etc.). God's word is also likened unto fire (Jer. 23:29). It is referred to as an emblem of severe trials or misfortunes (Zech. 12:6; Luke 12:49; 1 Cor. 3:13, 15; 1 Pet. 1:7), and of eternal punishment (Matt. 5:22; Mark 9:44; Rev. 14:10; 21:8). The influence of the Holy Ghost is likened unto fire (Matt. 3:11). His descent was denoted by the appearance of tongues as of fire (Acts 2:3).