freeway flyer
n.— «Especially since the effects of Proposition 13 began to kick in with a vengeance, community colleges have become ever more dependent on cheap labor provided by part-time faculty, who are often known as “freeway flyers” because they must drive from campus to campus to make a living. Rules permit part-timers to carry only half a full schedule at any one campus; they make up the difference flying the freeway to distant colleges.» —“Students and teachers suffer when money is scarce” by Eric Caine Modesto Bee (California) June 18, 2009. (source: Double-Tongued Dictionary)
Further reading
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If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...