Question

a bad workman blames his tools expansion of idea​

Answer 1

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$\textit{Blaming\:his\:tools\:is\:a\:bad\:workman's way\:of\:not\:owning\:up to his mistakes or taking responsibility for a job not done well. When a workman doesn't do his job right, he loses credibility and his clients are driven away. Thus, he cannot take ownership of the bad work since that will establish him as a poor workman.}$