One way to hold squint in your head: the eyes are not looking straight out at the world. Either the press down until only a thin slit is left, or the line of sight slides off to one side. Both are the same small idea — the look is off the straight line — and every meaning of squint, from a face in strong sunlight to a slanted opening in a church wall, can be seen growing out of it.
From the word’s history
Wiktionary derives squint from the older word asquint, meaning obliquely, with a sidelong glance. That root sits directly under the modern core: the idea of a look that runs at an angle rather than straight ahead.
Wiktionary 說 squint 來自更早的 asquint，意思是「斜斜地、用眼角看」。這個來源正好對上今天的核心畫面：視線走的是斜線，不是正前方。
Wiktionary (kaikki extract) entry 'squint', etymology_text: 'Derived from asquint ("obliquely, with a sidelong glance").' source_ref kaikki:3f6f69a190036ae4:803545034:31897
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