[on-th
uh-job, awn-] 
| done, received, or happening while in actual performance of one's work: on-the-job training. |
[job] noun, verb, jobbed, job⋅bing, adjective | 1. | a piece of work, esp. a specific task done as part of the routine of one's occupation or for an agreed price: She gave him the job of mowing the lawn. |
| 2. | a post of employment; full-time or part-time position: She was seeking a job as an editor. |
| 3. | anything a person is expected or obliged to do; duty; responsibility: It is your job to be on time. |
| 4. | an affair, matter, occurrence, or state of affairs: to make the best of a bad job. |
| 5. | the material, project, assignment, etc., being worked upon: The housing project was a long and costly job. |
| 6. | the process or requirements, details, etc., of working: It was a tedious job. |
| 7. | the execution or performance of a task: She did a good job. |
| 8. | Slang. a theft or similar criminal action: The police caught the gang that pulled that bank job. |
| 9. | a public or official act or decision carried through for the sake of improper private gain. |
| 10. | Slang. an example of a specific or distinctive type: That little six-cylinder job was the best car I ever owned. |
| 11. | Computers. a unit of work for a computer, generally comprising an application program or group of related programs and the data, linkages, and instructions to the operating system needed for running the programs. |
| 12. | to work at jobs or odd pieces of work; work by the piece. |
| 13. | to do business as a jobber. |
| 14. | to turn public business, planning, etc., improperly to private gain. |
| 15. | to assign or give (work, a contract for work, etc.) in separate portions, as among different contractors or workers (often fol. by out): He jobbed out the contract to a number of small outfits. |
| 16. | to buy in large quantities, as from wholesalers or manufacturers, and sell to dealers in smaller quantities: He jobs shoes in Ohio and Indiana. |
| 17. | to get rid of or dispose of: His party jobbed him when he sought a second term in office. |
| 18. | to swindle or trick (someone): They jobbed him out of his property. |
| 19. | to carry on (public or official business) for improper private gain. |
| 20. | of or for a particular job or transaction. |
| 21. | bought, sold, or handled together: He's too big a customer to buy in less than job quantities. |
| 22. | do a job on, Slang.
|
| 23. | on the job, alert; observant: The cops were on the job and caught them red-handed. |
| job 1 (jŏb) n.
v. intr.
[Perhaps from obsolete jobbe, piece, alteration of Middle English gobbe, lump; see gob1.] |
In the Old Testament, a man whose faith was severely tested by Satan, with God's permission. Job was the most prosperous and happy of men, who faithfully praised God for God's goodness. In order to get him to curse God, Satan destroyed all that Job owned, killed his children, and struck Job himself with vile sores from head to foot. False friends of Job's suggested that he should abandon his beliefs (see Job's comforters). But even in absolute misery, Job would not curse God, saying instead, “The Lord gave, and the Lord hath taken away: blessed be the name of the Lord.” As a reward for his steadfast faith, God healed Job and “gave him twice as much as he had before.”
Note: Figuratively, any long-suffering person can be said to be “as patient as Job.”
job
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on the job
At work, busy, as in We've got three men on the job. [Late 1800s]
Paying close attention, alert, as in Trust Jim to find out the details
he's always on the job.