gray out
To nearly faint or lose your vision briefly (like when a pilot pulls up fast), or to make a button on a screen look grey because it can't be used right now.
Meanings
In UI/UX design, to make an interface element appear greyed out and non-interactive to show it is currently unavailable.
"The 'submit' button is grayed out until all required fields are completed."
To experience a partial loss of vision or consciousness, usually due to reduced blood flow to the brain.
"The pilot began to gray out during the sharp climb and had to reduce speed."
In aviation and medicine, a 'gray out' (noun) is a partial loss of colour vision or consciousness caused by reduced blood flow to the brain, typically from high g-forces. In UI/UX design, 'greyed out' (British spelling: 'grayed out') means an element is disabled. The spelling 'grey out' is standard in British English.
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