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shadow; tail; following
私立探偵は容疑者を数日間尾行した。
The private detective shadowed the suspect for several days.
彼は尾行を撒こうとした。
He tried to shake off his tail.
記者たちは汚職官僚の不正を暴くため、慎重に尾行を行った。
The journalists carefully conducted a tail to expose the corrupt official's wrongdoing.