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Belt up! is an informal British and Australian English way of telling someone to be quiet – usually said in anger.
Example of use:
Belt up! I’m trying to study!
Image of belt by ingermaaike2
About Angela BoothroydAngela Boothroyd is an English language teacher providing face-to-face and online English lessons for speakers of other languages. She can be also found on Twitter @StudyingOnline, Facebook and the Studying Online website
How fun to see something I made in such an educational way
Thank you for sharing your photo, Inger
It’s just right for this phrasal verb post. Love your blog, by the way 
Angela.