yesterday (EN)

adverb, noun

adverb “yesterday”

1. refers to the day that came immediately before the current day
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   I lost my keys yesterday and found them under the couch this morning.
2. (informal) used to express the need for something to be done very urgently, as if it should have been completed in the past
   When should we do it? Yesterday.

noun “yesterday”

1. describes the day that occurred one day ago
   Yesterday was so sunny compared to today's rain.
2. (figuratively) represents a time in the past, typically suggesting that something is no longer current or modern
   In this fast-paced world, dial-up internet is yesterday's technology.