(idiomatic) To run out of energy or motivation.

(mnemonic) Used for remembering that the slope of a non-vertical line is the ratio of the amount it rises over some interval, over the length of that interval.

(simile, usually of motorized machinery) To operate flawlessly and smoothly.

(idiomatic, transitive) To spend a lot of time doing things for another person or group of people. Often used when that person could reasonably do the things for themselves.

(idiomatic) To alternate between two opposite extremes, such as enthusiasm and disinterest or success and failure.

(originally US, idiomatic) To exhaust; to demand excessive effort or work from somebody.

(transitive) To begin to encounter problems with (someone or something).

(baseball) To hit a ball during an at-bat that results in all runners on base and the hitter scoring runs; the best result of an at-bat. / (figuratively) To achieve the best possible result.

Third-person singular simple present indicative form of run up against

present participle of run up against