V-ERG
(使)變粗俗;（使）變粗魯
If someone's behaviour or speech coarsens or if they coarsen it, they become less polite or they begin to speak in a less pleasant way.
例句
Her voice has deepened and coarsened with the years...
隨著歲月的流逝，她的聲音變得低沉粗魯起來。
He had coarsened his voice to an approximation of Cockney.
他讓自己的口音變得粗俗起來，接近倫敦東區的發音。