ichidan verb, intransitive verb
become vulgar; coarsen
Describes speech, behavior, or attitude becoming crude or low-class. Often used in the 〜た/て form (e.g., 下卑た言い方).
See also: びる
彼の下卑た笑い声が不快だった。
His vulgar laugh was unpleasant.
When he drinks, his language becomes coarse.