squinting
"Squinting" is a versatile word with a few closely related meanings. It mainly describes what your eyes do when you partially close them, but it also has a useful figurative sense and even a grammatical one that writers and editors use.
When you squint, you close your eyes partway — not fully shut, but narrowed. People do this when a light is too bright, when they are trying to see something far away, or when they are concentrating hard on something small. Think of how you look at the sun for a second: your eyes automatically narrow. That is squinting.
everyday language · Modern, widely used
Sometimes 'squinting' suggests looking at something in a doubtful, suspicious, or critical way — not just narrowing your eyes physically, but examining something with a skeptical attitude. If someone squints at your idea, they are looking at it carefully and perhaps not fully trusting it.
everyday language · Modern, widely used · figurative
As a noun, a 'squint' (and 'squinting' as its related form) refers to a medical condition where a person's eyes do not point in the same direction at the same time. One eye may look straight ahead while the other turns inward or outward. Doctors call this 'strabismus', but in everyday English — especially in British English — people simply say 'a squint'.
medicine / everyday language · Modern, widely used
In grammar, a 'squinting modifier' is a word or phrase placed in a sentence so that it is unclear whether it describes the words before it or the words after it. It 'squints' in two directions at once, which makes the sentence confusing. For example: 'Students who study often get good grades' — does 'often' mean they study often, or they often get good grades? That ambiguity is a squinting modifier.
grammar / writing · Modern, used in academic and editorial contexts