1. a clear sign that something is about to go badly or come to an end
Professional
Social
see the writing on the wall and resign
When you say 'the writing is on the wall' it means there is a clear or certain sign that something is about to go wrong or become difficult. Saying 'the writing is on the wall' is a prediction of bad luck or that something will no longer exist. This is an idiomatic expression and can be singular or plural.