The name is short for: (cat) when in (v)erbose mode
1  | catv(..., verbose = detect.verbose())
 | 
... | 
 arguments to write out  | 
verbose | 
 logical or NA, logical values turn verbose mode on and off; a value of NA implies that verbose mode is inferred from a "verbose" variable in a parent environment or from global options.  | 
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