expression
while saying; with these words
Used to describe an action that occurs simultaneously with speaking, or to introduce a quoted statement followed by an action. Often appears in narrative contexts.
彼は「さようなら」と言いながら、手を振った。
He waved his hand while saying goodbye.
「大丈夫」と言いながら、彼女は微笑んだ。
Saying 'It's okay,' she smiled.