turn and turn about en · ADV
Meanings
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(not-comparable) By equal alternating periods of service or duty; by turns.
[...] the three streamliners, still on their 29½ hr. schedule, start at 9.40 a.m., also turn-and-turn-about, and so arranged that the 9.0 and 9.40 a.m. departures are by different routes each day; [...].
1942 May-June, “Notes and News: War and the American Railways”, in Railway Magazine, page 185: