Learn more about Grammar:
Adjectives: An Easy Guide with ExamplesAdverbial Clauses: What Are They?AdverbsAnalogy: Definition & Meaning (with Examples)ArticlesBad AdverbsClauses: Definition, Meaning, and How to Use ThemConjunctionsCoordinating Conjunctions: What Are They and When Should You Use Them?Dangling ModifiersDeclarative Sentence: Examples + MeaningExaggerationHomophones: Definition and ExamplesHow to Use Subordinating ConjunctionsInfinitivesInterjections: Definition, Meaning, and ExamplesIntransitive Verb: Definition, Meaning, and ExamplesNounsParticiples PluralsPrepositional Phrase: What Is It & How to UsePrepositionsSplit Infinitive: The Complete Guide (with Examples)Subordinate Clause: Definition, Types, and ExamplesThe Complete Guide to Transitive VerbsTransitions: A Complete Guide (with 100+ Examples)Types of VerbsVerbsWhat is a Pronoun? Rules and ExamplesWhat Is Symbolism in Writing?Word ClassesWhat is a squinting modifier?

Modifiers are the words that add interest and depth to your writing. However, if not used properly, they can add confusion and even accidental hilarity.
A squinting modifier is one that could modify one of two words. Hence, it is unclear which word it is modifying.
He told her eventually he'd have to stop working: it is unclear if 'eventually' is modifying 'told' or 'stop'. Did he tell her after a long time, or will he eventually have to stop working?
Correcting a squinting modifier is simple. You just need to move the modifier closer to the word that it is modifying. e.g. He told her he'd eventually have to stop working.