Synonym of get down to brass tacks.
get down to bedrock
get down to brass tacks
To (start to) consider or deal with the most important details or fact …
take down a peg
Synonym of take down a notch.
knock down a peg
down the tubes
Synonym of down the toilet: wasted; irretrievable.
go down the khazi
Synonym of go down the toilet: to fail; to degenerate rapidly.