spoonerism /ˈspuːnəˌrɪzəm/

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  N-COUNT A spoonerism is a mistake made by a speaker in which the first sounds of two words are switched, often with a humorous result, for example when someone says "wrong load" instead of "long road." 首音误置; 说话时误把两个单词的首音掉换，常造成滑稽效果，如将long road说成wrong load