Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
CLOCKS-SUMMER, n. comb., pl. “The sunbeams dancing in the atmosphere during a fine summer day” (Sh. 1866 Edm. Gl.), the vibration of the air near the ground in hot weather. E.D.D. Suppl. (1905) gives clock-summer in this sense for n.Yks. Cf. summer cloks, — couts, id. (s.v. Simmer).
[See Clock, n.4, 2, and etym. note.]