spoonerism
noun [ C ] language uk/ˈspuː.nər.ɪ.zəm/ us/ˈspuː.nɚ.ɪ.zəm/
首音误置，首音互换（说话时误将两个单词的首音调换，常会造成滑稽效果）
a mistake made when speaking in which the first sounds of two words are exchanged with each other to produce a not intended and usually funny meaning
The Reverend William Spooner used to produce spoonerisms such as "a scoop of boy trouts" instead of what he meant to say - "a troop of boy scouts". 威廉•斯普纳牧师过去说话时常将首音误置，如本来想说 a troop of boy scouts，却说成 a scoop of boy trouts。