tailbone به انگلیسی
From Longman Dictionary
tail‧bone /ˈteɪlbəʊn $ -boʊn/ noun [countable]
the small bone at the bottom of your spine
Example
Somehow he had landed on his backside and then had felt his tailbone knock the earth harder than was safe
His voice was so low that it tickled my tailbone
His voice was so low that it tickled my tailbone
His voice was so low that it tickled my tailbone
His voice was so low that it tickled my tailbone
