spoonerisms

英 [ˈspuːnərɪzmz]

美 [ˈspunərɪz(ə)mz]

n.  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)
spoonerism的复数

柯林斯词典

• (说话时的)首音误置(如将long road 说成 wrong load)
  Aspoonerismis a mistake made by a speaker in which the first sounds of two words are changed over, often with a humorous result, for example when someone says 'wrong load' instead of 'long road'.