(statistics) A graphical summary of a numerical data sample through five statistics — median, upper quartile, lower quartile, and upper extreme and lower extreme values — by depiction as a box with its edges at the quartile marks and an internal line at the median and with lines protruding from the box as far as the extremal values.

A device that converts an incoming signal into a format displayable by a television.

(software, testing) The testing of the internal structure, rather than the functionality, of a system.

(software, testing) Any form of testing in which knowledge of the internals of the system being tested are unknown and unimportant.

Alternative form of post office box and PO box.

(simile, slang) Very stupid.

(soccer) penalty box

(idiomatic) To create a predicament or problem for oneself; to do something that leaves one with no good alternatives or solutions.

plural of 18-yard box

(idiomatic, politics) To commit fraud in an election by depositing extra or otherwise illegitimate ballots into the container holding voters' ballots, in an attempt to predetermine the outcome.