A colorable claim is a plausible legal claim. This means that the claim is “strong enough” to have a reasonable chance of being valid if the legal basis is generally correct and the facts can be proven in court. Note that the claim need not actually result in a win.
See e.g., Guerrier v. Garland 18 F.4th 304 (2021); see also e.g., Kenoyer v. Barnhart 49 F. App'x 173 (9th Cir. 2002)
[Last updated in July of 2022 by the Wex Definitions Team]