Verbose is the name of an optional argument. Its value is an integer, which specifies how verbose output of the above commands should be. Default value is 0 which gives the tersest possible output. Highest verbosity is attained with the value 4.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/VersalDeformations.m2:1288:0.