noun
every word and deed; each and every word and action
A yojijukugo emphasizing that every single utterance and behavior is under scrutiny, often used in contexts of responsibility, caution, or moral discipline.
政治家は一言一行に責任を持たなければならない。
Politicians must take responsibility for their every word and deed.
彼は一言一行が丁寧で、周囲から信頼されている。
He is trusted by those around him because his every word and action is polite.