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over-frequency
over-frequency n.
Brit. 
/ˌəʊvəˈfriːkw(ə)nsi/
, /ˌəʊvəˈfriːkw(ə)nsi/U.S. /ˌoʊvərˈfrikwənsi/
/ˌoʊvərˈfrikwənsi/ΚΠ
1904 N.E.D. at Over- Over-frequency.
1934 Times 5 Apr. 12/4 If the public becomes exasperated by the over-frequency of such appeal they will be killing the goose that lays the golden eggs.
1970 R. H. Miller Power Syst. Operation viii. 90 Overfrequency is less hazardous to a power system than low frequency.
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