At the announced or expected time, as in Her first baby arrived right on schedule. Originally alluding to published railroad timetables, this expression dates from the late 1800s.
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expeditious, dependable, accurate, careful, conscientious, constant, early, exact, fussy, heedful, meticulous, painstaking, particular, periodic, precise, prompt, punctilious, quick, ready, recurrent
- on purpose,
- on record,
- on relief,
- on request,
- on sale,
- on second thought,
- on sight,
- on someone's,
- on someone's back,
- on someone's coattails
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.