From Longman Dictionary of Contemporary Englishwriter's blockˌwriter’s ˈblock noun [uncountable] ALthe problem that a writer sometimes has of not being able to think of new ideas
Examples from the Corpus
writer's block• Fink, not surprisingly, gets writer's block and at some stage the film becomes his fevered imaginings.• Unfortunately he seems to have had writer's block for nine of them.• When in the grip of writer's block I might stand up and walk to the window and look out. 