let sleeping dogs lie
Definition:  do not keep bringing up forgotten incidents as they may make others uncomfortable
Usage:  let us not dwell much on the past, may we just let sleeping dogs lie

SEPEDI
Translation:  tlogela mpša tšeo di robetšego di robale
Proverb: lenga la letšatši le tsošwa ke la pula

XITSONGA
Translation:  pfumelela timbyana leti nga etlela ti etlela
Proverb: u nga bulumuxi mpfundla wu tietlelerile

TSHIVENḒA
Translation:  litsha mmbwa dzo eḓelaho dzi eḓele
Proverb: tsha mmbwa ndi tsho vuwaho, tsho lalaho a tshi vhonali