I am getting errors when I try to drop a column in sql server table.

Server: Msg 5074, Level 16, State 1, Line 1
The object 'DF__bdp_langu__langn__29572725' is dependent on column 'langname_ge'.
Server: Msg 4922, Level 16, State 1, Line 1
ALTER TABLE DROP COLUMN langname_ge failed because one or more objects access this column.

I thought the object to be a constraint and tried dropping it first by "alter table drop constraint" command.

But query analyser says that the concerned object is not a constraint. How do I drop this object?

Thanks and Regards,