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yesterday (EN)
adverbio, sustantivo

adverbio “yesterday”

yesterday (more/most)
  1. ayer
    I lost my keys yesterday and found them under the couch this morning.
  2. para ayer (se usa para indicar que algo se necesita con mucha urgencia, como si ya debiera haberse hecho)
    When should we do it? Yesterday.

sustantivo “yesterday”

sing. yesterday, pl. yesterdays o no contable
  1. el ayer
    Yesterday was so sunny compared to today's rain.
  2. el ayer (se refiere a un tiempo pasado, sugiriendo que algo ya no es actual o moderno)
    In this fast-paced world, dial-up internet is yesterday's technology.