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present participle and gerund of challenge examples
comparative more challenging, superlative most challenging
Difficult, hard to do. examples
plural challengings
The act of making a challenge. quotations examples
There are always sincere challengings of the findings, always the objections (sincere in another sense) of those whose interests seem threatened.
1918, Estcourt Rowland Metzner, The conflict of tax laws, page 151