A jobsworth is a person who uses the (typically minor) authority of their job in a deliberately uncooperative way, or who seemingly delights in acting in an obstructive or unhelpful manner. It characterizes one who upholds petty rules even at the expense of effectiveness, efficiency, or common sense.
It is a British colloquial word derived from the phrase ‘I can’t do that, it’s more than my job’s worth,’ meaning that failing to do what is requested of them would be against what their job requires and would be likely to cause them to lose their job. English lexicographer Jonathon Green similarly it as ‘a minor factotum whose only status comes from enforcing otherwise petty regulations.’
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The Daily Omnivore 