coarsen

1.[i][t]（使）变厚，变粗糙to become or make sth become thicker and/or rougher

2.[t][i]（使）变得粗鲁无礼to become or make sb become less polite and often offensive in the way they behave

1.(使)变粗糙

1.to become rough and hard, or to make something become rough and hard

2.to become larger and thicker, or to make something become larger and thicker

3.to make someone or something less polite or less sensitive