If he dared to swear, his father would lather him.
Advanced English Dictionary
noun, verb +noun[U, sing.] a white mass of small bubbles that is produced by mixing soap with water: to work up a good lather Idioms: get into a lather work yourself into a lather (BrE, informal) to get anxious or angry about sth, especially when it is not necessary: Calm down-don't work yourself into a lather about it. in a lather (BrE, informal) in a nervous, angry or excited state: Dad was in a right lather about something. +verb 1[VN] to cover sth with lather: I lathered my face and started to shave. 2[V] to produce lather: Soap does not lather well in hard water.
Random quote: Never apologize for showing feelings. When you do so, you apologize for the truth.: Benjamin Disraeli