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.

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.

Definitions of wall
wall (n.)
an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure;
the walls were covered with pictures
the south wall had a small window
wall (n.)
anything that suggests a wall in structure or function or effect;
a wall of smoke
a wall of prejudice
negotiations ran into a brick wall
a wall of water
wall (n.)
(anatomy) a layer (a lining or membrane) that encloses a structure;
stomach walls
Synonyms: paries
wall (n.)
a difficult or awkward situation;
his back was to the wall
competition was pushing them to the wall
wall (n.)
a vertical (or almost vertical) smooth rock face (as of a cave or mountain);
wall (n.)
a layer of material that encloses space;
the walls of the cylinder were perforated
the container's walls were blue
wall (n.)
a masonry fence (as around an estate or garden);
he ducked behind the garden wall and waited
the wall followed the road
wall (n.)
an embankment built around a space for defensive purposes;
they blew the trumpet and the walls came tumbling down
Synonyms: rampart / bulwark
wall (v.)
surround with a wall in order to fortify;
Synonyms: palisade / fence / fence in / surround