Breakdown of Всё то, что накопилось, выплеснулось вчера.
что
what
вчера
yesterday
тот
that
весь
all, the whole, everything, everyone (весь, вся, всё, все)
Questions & Answers about Всё то, что накопилось, выплеснулось вчера.
Why use Всё то, что instead of just Всё, что?
You can absolutely say Всё, что, which is the standard way to say "Everything that." Adding то (literally "All that, which") just adds emphasis. It makes the statement feel more definitive and dramatic, which perfectly fits the emotional weight of things finally spilling out.
Why are both verbs (накопилось and выплеснулось) in the neuter past tense?
They both agree with the main subject of the sentence, which is the pronoun Всё (everything). In Russian, всё functions as a neuter singular noun, so any past tense verb connected to it must take the neuter reflexive ending -ось.
I don't recognize выплеснулось. What is the literal meaning here?
It comes from the verb плескать (to splash) combined with the prefix вы- (out). Literally, it means a liquid "splashed out" of a container. In this sentence, it is used metaphorically to mean that pent-up emotions or frustrations finally erupted or boiled over.
What is the function of the reflexive suffix -сь in both of these verbs?
Here, the reflexive suffix shows that the action happened spontaneously or on its own. Without it, накопить means to actively save or accumulate something, and выплеснуть means to physically splash something out. Adding -ся/-сь turns them into "built up" and "spilled out" as events that just happened organically.