keep time

Meaning

1. To measure time.
2. To indicate the time correctly (of a timepiece).
3. To make any regular rhythmical movements at the same time with others.
4. To control the beat or rhythm of a song played by a music group.
5. To maintain a schedule set out in a timetable. (e.g. of a train)

Synonyms

on time

be punctual

Etymology

Inherited from Middle English: time kepen

In summary

From Middle English time kepen, kepen time, etc.