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over-flatten
over-flatten v.
Brit. 
/ˌəʊvəˈflatn/
, /ˌəʊvəˈflatn/U.S. /ˌoʊvərˈflætn/
/ˌoʊvərˈflætn/ΚΠ
1904 N.E.D. at Over- Over-flatten.
1986 Toronto Star (Nexis) 27 Sept. e14 It is better to overflatten it slightly so when it dries out a bit indoors it will be just right.
1992 Yoga Jrnl. Jan. 36/3 Those who have overflattened the lumbar spine.
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