What does the idiom "olive branch" mean?

• The idiom "olive branch" means - Symbol of peace.

• Olive branch
- English Meaning: A symbol of peace; something you say or do to show that you wish to make peace with somebody.
- Bangla Meaning: শান্তির প্রতীক।

• Example Sentence: After their long fight, he extended an olive branch by saying sorry.
- Bangla Meaning: দীর্ঘ ঝগড়ার পর সে দুঃখ প্রকাশ করে শান্তির প্রস্তাব দিল।

Source: Merriam & Webster Dictionary, Oxford Dictionary, Accessible Dictionary.