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Phrase(s): put one off one’s stride
1. Lit. to cause one to deviate from a rhythmic stride while walking, running, or marching. • A rabbit ran across the path and put me off my stride. 2. Fig. to interfere with one’s normal and natural progress or rate of progress. • Your startling comments put Larry off his stride for a moment. • He was put off his stride by an interruption from the audience.
McGrawhill's American Idioms And Phrasal Verbs