olive branch
noun /ˈɒlɪv brɑːntʃ/
/ˈɑːlɪv bræntʃ/
[usually singular]- a symbol of peace; something you say or do to show that you wish to make peace with somebody
- Management is holding out an olive branch to the strikers.
Word Originin refernce to the story of Noah in the Bible, Genesis 8:1, in which a dove returns with an olive branch after the Flood, taken as a symbol of peace after God's punishment of mankind.