The phrase "stale saying" can refer to a cliche or an over-used expression. Other synonyms for this phrase include "chestnut," "platitude," "truism," and "hackneyed phrase." A "chestnut" is a phrase or story that has been repeated so often that it is no longer interesting or engaging. A "platitude" is a trite remark or statement that lacks originality or depth. A "truism" is a statement that is indisputably true and widely accepted. A "hackneyed phrase" is a trite and over-familiar expression that has lost its impact and significance. In essence, all of these synonyms are used to describe a phrase that has lost its novelty and no longer has any impact or value.