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.