“蒙混过关”常见的英文表达有 get away with something by deception、slip through（the net）by trickery 或 pull through by faking it 等，具体使用可根据语境选择：
1、 Get away with something by deception
强调通过欺骗手段侥幸逃脱或达成目的。
例句：He tried to get away with cheating in the exam, but the teacher caught him.（他试图在考试中蒙混过关，但被老师发现了。）
2、 Slip through（the net）by trickery
“slip through”原指“漏网”，搭配“trickery”（欺骗）更贴合中文的“蒙混”。
例句：She slipped through the security check by trickery.（她通过欺骗手段混过了安检。）
3、 Pull through by faking it
“pull through”有“侥幸成功”之意，“faking it”直指“假装/糊弄”。
例句：He managed to pull through the interview by faking his experience.（他靠假装有经验蒙混过了面试。）
其他选择：Bullshit one's way through（口语化，略显粗俗，慎用）
Con one's way through（“con”作动词，指“欺骗”）
总结：正式场合推荐 get away with something by deception 或 slip through by trickery。
口语中可用 pull through by faking it，但需注意语境是否合适。