cock something up
phrasal verb with cock verb uk/kɒk/ us/kɑːk/
UK slang
把…弄糟；把…搞砸；破坏
to do something wrong or badly
David cocked up the arrangements and we ended up missing the reception. 戴维安排得一团糟，结果我们误了招待会。
"How did the exam go?" "Terrible - I panicked and really cocked it up." “你考得怎么样?”“糟透了——我怯场，考得真是一塌糊涂。”