In someone’s face，是一个固定美语短语，其英文释义为：in a confrontational way that shows annoyance or contempt; involving confrontation; defiant; provocative; In front of or against someone directly。其中文意思为：以一种使人不快、轻蔑的方式与…对峙；与…直接对立。具体可翻译为：（就）在…面前，当着…的面。注意这里的介词使用in，类似于in front of。in someone’s face出现的语境往往具有较浓的挑衅、对抗意味。
参考例句：He slammed the door in her face。（他当着她的面甩门而去。）在经典美国电影A Few Good Men中，Demi Moore有这样一句台词，其中就用到了in your face：”My job is to make sure that you do your job, so my jurisdiction’s pretty much in your face“。（我的责任是确保你恪尽职守，因此我的管辖权清清楚楚就在你面前。）点击这里收听该句的原声英文音频。
参考链接：
http://www.dictionary.com/browse/in-someone-s-face
http://idioms.thefreedictionary.com/in+someone%27s+face