plural of one pump chump

(rail transport, UK) A principle in railway signalling where only one train or locomotive is allowed to run on a section of single-track line, such as a branch line, at any one time.

(often with 'against') To engage in a test of mental skill.

The slightest shred of some personal characteristic (specified with a preceding adjective).

(UK, informal) Synonym of earn one's keep

(figuratively) to learn to avoid repeating a mistake.

present participle of do one's job

Third-person singular simple present indicative form of do one's job

To properly do the work one is supposed to do.

simple past tense of do one's job