(design, typography) A unit of measurement of the number of typographic characters that fit on a one inch line of printed type. This unit is mainly used to specify font sizes that have the same width for each character (monospaced), however it may also be used to give an average for fonts with characters of varying widths.

(graphic design, typography) The measure of a number of pixels per inch used in a graphic or supported by a digital display device, used to specify type or image resolution.

Covering a large set of topics but on a very shallow level.

To a point where one is at great risk of death; or (figuratively, hyperbolic) of severe danger or trouble. / (figuratively, hyperbolic) Almost as much as possible; to an extreme extent.

Granting someone a limited concession will encourage them to take greater liberties.

(idiomatic) Alternative form of give them an inch and they'll take a mile

Dated form of give them an inch and they'll take a mile.