To expose, disclose or reveal something that was hidden or unknown.
shed light upon
Illuminate to the understanding; make intelligible; clarify or explain…
spill the beans
To reveal a secret; to disclose information.
let something slip
To accidentally reveal a secret.
give the lie to
To reveal or prove (something) to be false; to refute.
show one's cards
To reveal something known to oneself but previously concealed from oth…
drop a hint
To reveal a clue or hint about something.