Yesterday in a sentence as a noun

Actually that's exactly what I thought when I saw the list yesterday.

If it were just luck, the “supers” would regress to the mean: yesterday’s champs would be today’s chumps.

The YC partners were having lunch yesterday and he suggested posting this RFS.

Yesterday in a sentence as an adverb

We turned on a new enforcement system yesterday that took user feedback much more heavily into account.

"Note: a second co-founder did email me for the first time around 2am yesterday, suggesting we meet for coffee as he 'would enjoy meeting' me.

In particular, the handoff between guest accounts and "real" trial accounts is of paramount importance to my business but is meaningless to customers who have guest accounts until they get to school, at which point they will often discover, to their surprise, that failing to make the decision yesterday to give me their email address now means their cards are totally inaccessible.

Yesterday definitions

noun

the day immediately before today; "it was in yesterday's newspapers"

noun

the recent past; "yesterday's solutions are not good enough"; "we shared many yesterdays"

adverb

on the day preceding today; "yesterday the weather was beautiful"

adverb

in the recent past; only a short time ago; "I was not born yesterday!"