This is the 1536th most frequent French word.
hier
"Hier" means "yesterday."
In this sentence, 'hier' is used as a temporal adverb indicating the time 'yesterday.'
Hier, je suis allé au marché.
Yesterday, I went to the market.
Here, 'hier' again serves as a time adverb, referring to the day before today.
Je pensais à ce que tu as dit hier.
I was thinking about what you said yesterday.
In this case, 'hier' is emphasized to specify the particular day of an event.