1One's choice of words and manner of speaking, including the appropriate register (polite, honorific, casual) for the listener and situation.
お客様に対する言葉遣いには特に気をつけてください。
Please be especially careful about how you speak to customers.
彼の乱暴な言葉遣いに驚いた。
I was surprised by his rough way of speaking.
就職の面接では丁寧な言葉遣いを心がけよう。
Let's try to use polite language in job interviews.
地域によって言葉遣いに違いが見られる。
There are differences in speech patterns depending on the region.