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Not apparent to me that the given citations are anything other than "secret and/or sacred", which would be sum of parts and not plausibly idiomatic. But perhaps this does have a specific use in the Australian context? -- Visviva 18:23, 6 March 2009 (UTC)
- Hyphenated form seems somewhat common:  This caught my eye in particular (from the Charlesworth book): "The term 'secret-sacred' is well known in the literature on Aboriginal Australia and is used to designate either men's or women's religious knowledge." Equinox ◑ 19:15, 6 March 2009 (UTC)
- Strong delete (or better, rename) only one citation in the article, which doesn't seem to be anything put an abbreviated form of secret or sacred. Mglovesfun (talk) 19:18, 4 July 2009 (UTC)