The average (mean) pressure which, if imposed on the pistons uniformly from the top to the bottom of each power stroke, would produce the measured (brake) power output.

A request for clarification of an anterior statement or question. / An expression of surprise, annoyance, or disagreement to an anterior statement.

(idiomatic) Have a lifestyle where one's spending regularly exceeds one's income.

plural of brake mean effective pressure

plural of mean distance between failure

A request for clarification of what the listener just said.

Third-person singular simple present indicative form of live beyond one's means

simple past tense and past participle of live beyond one's means

present participle of live beyond one's means

(informal, idiomatic) Indicating that one is serious and not joking about a matter.