to unload or deposit drop (something unwanted, e.g. refuse) in a heap or mass
to deposit or drop (something) carelessly or heavily
to abandon or rid oneself of (something or somebody) unceremoniously or irresponsibly
to sell (goods) (something) in quantity at a very low price, esp to sell it abroad at less than the market price at home
to copy (computer data in a computer's internal storage) to an external storage medium
to get rid of refuse, etc
informal (+ on) to criticize (somebody) severely
to treat (somebody) badly or without respect