-you were marking
The word marcabas is the imperfect form of marcar in the second person singular. There are other translations for this conjugation.
See the full marcar conjugation


Un pequeño experimento para ver dónde marcabas el límite.
A little experiment, to see where you draw the line.
Si daba tono y marcabas un número, lo normal era que dos de cada tres veces no conectaras con él.
If there was a dial tone and you dialed a number, the odds were two in three you wouldn't get the number you were intending to reach.
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