Depreciation means gradual and permanent decrease in the 
value of asset due wear and tear,technology changes and 
laps of time.
entering the transaction on both debit and credit side.

depreciation: an increase in the value of the asset is 
called depreciation
double entry: any transaction entering both debit side and 
credit side is caled doublr entry.
assets: current assets, fixed assets, liquid assets, 
intangible assets.
liabilitirs: current liabilities, fixed liabilities

Depreciation is the continuous decrease in the value of 
assets. 

Depreciation is debited and the assets on which it is 
charged is credited, e.g. 

Depreciation A/C   Dr.      Rs.xxxxx
     To, Machinery A/C                   Rs.xxxxx

In my 12 years of accounting experience I have never heard 
of charging depreciation on liability.