From Longman Dictionary of Contemporary Englishput somebody off their strideput somebody off their strideespecially British English, knock/throw/keep somebody off stride American EnglishATTENTION to make someone unable to do something effectively, by not allowing them to give all their attention to it Shea’s testimony threw the defense off stride. → stride
Examples from the Corpus
put somebody off their stride• Human experimenters have found it surprisingly difficult to put bats off their stride by playing loud artificial ultrasound at them. 