Etymology
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wall (v.)
"to enclose with a wall," late Old English *weallian (implied in geweallod), from the source of wall (n.). Meaning "fill up (a doorway, etc.) with a wall" is from c. 1500. Meaning "shut up in a wall, immure" is from 1520s. Related: Walled; walling.
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wall (n.)

Old English weall, Anglian wall "rampart, dike, earthwork" (natural as well as man-made), "dam, cliff, rocky shore," also "defensive fortification around a city, side of a building," an Anglo-Frisian and Saxon borrowing (Old Saxon, Old Frisian, Middle Low German, Middle Dutch wal) from Latin vallum "wall, rampart, row or line of stakes," apparently a collective form of vallus "stake," from PIE *walso- "a post." Swedish vall, Danish val are from Low German.

Meaning "interior partition of a structure" is mid-13c. In this case, English uses one word where many languages have two, such as German Mauer "outer wall of a town, fortress, etc.," used also in reference to the former Berlin Wall, and wand "partition wall within a building" (compare the distinction, not always rigorously kept, in Italian muro/parete, Irish mur/fraig, Lithuanian mūras/siena, etc.). The Latin word for "defensive wall" was murus (see mural).

Anatomical use from late 14c. To give (someone) the wall "allow him or her to walk on the (cleaner) wall side of the pavement" is from 1530s. To turn (one's) face to the wall "prepare to die" is from 1570s. Phrase up the wall "angry, crazy" is from 1951; off the wall "unorthodox, unconventional" is recorded from 1966, American English student slang. To go over the wall "escape" (originally from prison) is from 1933. Wall-to-wall (adj.) recorded 1939, of shelving, etc.; metaphoric use (usually disparaging) is from 1967.

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wallboard (n.)
1912, American English, from wall (n.) + board (n.1).
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wallpaper (n.)
also wall-paper, 1827, from wall (n.) + paper (n.).
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firewall (n.)
also fire-wall, 1851 as a physical wall meant to prevent the spread of fire in a structure, from fire (n.) + wall (n.). Computer sense (originally figurative) is by 1990.
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drywall (n.)

"plasterboard, sheetrock; gypsum-based manufactured panel used in interior construction," by 1952, from dry (adj.) + wall (n.). Earlier dry wall meant "a wall built without mortar" (1778).

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wallflower (n.)
1570s, type of flowering plant cultivated in gardens, native to southern Europe, where it grows on old walls and in rocky places, from wall (n.) + flower (n.). Colloquial sense of "woman who sits by the wall at parties, often for want of a partner" is first recorded 1820.
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Wall Street (n.)
"U.S. financial world," 1836, from street in New York City that is home to many investment firms and stock traders, as well as NYSE. The street so called because it ran along the interior of the defensive wall of the old Dutch colonial town.
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wall-eyed (adj.)

c. 1300, wawil-eghed, wolden-eiged, "having very light-colored eyes," also "having parti-colored eyes," from Old Norse vagl-eygr "having speckled eyes," from vagl "speck in the eye; beam, upper cross-beam, chicken-roost, perch," from Proto-Germanic *walgaz, from PIE *wogh-lo-, suffixed form of root *wegh- "to go, move, transport in a vehicle." The prehistoric sense evolution would be from "weigh" to "lift," to "hold, support." Meaning "having one or both eyes turned out" (and thus showing much white) is first recorded 1580s.

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hole-in-the-wall (n.)
"small and unpretentious place," 1816, perhaps recalling the hole in the wall that was a public house name in England from at least 1690s. "Generally it is believed to refer to some snug corner, perhaps near the town walls," but the common story was that it referred to "the hole made in the wall of the debtors' or other prisons, through which the poor prisoners received the money, broken meat, or other donations of the charitably inclined" [Jacob Larwood and John Camden Hotten, "The History of Signboards: From the Earliest Times to the Present Day," 1867]. Mid-19c. it was the name of the private liquor bar attached to the U.S. Congress.
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