An "arguable claim" refers to a statement or assertion that can be debated or disagreed upon. It means that people can have different opinions about it and can provide reasons and evidence to support their viewpoint. Full definition
That's an arguable claim at best, given the sizable amount that went to the teachers contract. (b4njkids.org)
That's an arguable claim, but other manufacturers have followed suit with tablets like the 2013 Google Nexus 7 (a 7 - inch screen with 1,920 x1, 200 pixels and 323ppi); the Microsoft Surface Pro 3 (a 12 - inch screen with 2,160 x1, 440 pixels and 216ppi); and the Samsung Galaxy Tab Pro 10.1 (named for its screen size, with 2,560 x1, 600 pixels and 299ppi). (computershopper.com)
I think this strange and troubling situation is at the root of all the dismay with these proceedings, and that Michael Schiavo's illegitimate status as guardian by operation of Florida law raises a claim under the 14th Amendment that ought to have been examined fully and ruled upon, and that there is at least an arguable claim of unconstitutionality of any «guardianship» statute that ignores such facts. (legalblogwatch.typepad.com)