Longman Dictionary of Contemporary English homepage

bang

3 adverb
     
bang3
1 informal directly or exactly:
The train arrived bang on time.
The technology is bang up to date.
2

bang on

British English spoken exactly correct:
'Is that right?' 'Bang on!'
3

bang goes something

British English spoken used to show that you are unhappy because something you had hoped for will not happen:
Bang goes my brilliant plan.
4 spoken in a sudden violent way:
I skidded and went bang into the wall.
5

go bang

informal to explode or burst with a loud noise

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