In for a penny, in for a pound.

既已投下一便士，爽再一英镑；一不做，二不休。

In for a penny, in for a pound!

[字面意思]赌一便士是赌，赌一英镑也是赌。

In for a penny, in for a pound!

辄赌一便士是赌，赌一英镑也是赌。