I found the word "ice-free" is pronounced /ˈˌaɪsˈˌfri/ in Oxford English Dictionary, but what kind of stress is this? Should it be called 'there are two primary stresses and two secondary stresses?'
Thank you in advance! :)
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It means it is pronounced either /ˈaɪsˌfri/ or /ˌaɪsˈfri/. This notation of "¦" standing for "primary or secondary stress" was devised in Webster's Third (1961) by its pronunciation editor, Edward Artin (according to Windsor Lewis).