A luz.
The light.
Language note: Feminine noun: “a luz”. Plural is irregular: “as luzes”.
Culture note: At the gates/validators, the light colour is your quick yes/no: green usually means OK; red means try again or ask staff.
Context: They explain what you should look at to confirm it worked: the light.
Word-by-Word Breakdown
A
[ah]
the (feminine singular)
Definite article used before feminine singular nouns; here it refers to a specific light/indicator.
A luz do leitor acende quando aproximas o cartão.
The reader’s light turns on when you bring the card close.
luz
[looz]
light; indicator light
Can mean light in general, or an indicator light on a machine; at metro gates it’s the small validation light.
A luz do validador está intermitente.
The validator light is flashing.
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