Get down to business

To begin focusing seriously on the important task at hand, setting aside distractions or preliminaries. To start working earnestly on what needs to be accomplished.

This phrase emerged in the 19th century American business culture, where 'business' meant serious work or important matters. The 'get down' part suggests settling into work, similar to 'getting down to brass tacks,' reflecting the practical, no-nonsense attitude of American commerce during the Industrial Revolution.