This is the 15623rd most frequent Russian word.
признаваться
To confess or admit.
Here, "признаваться" is used to mean confessing or admitting a fault or mistake.
Я должен признаться в своих ошибках.
I must admit my mistakes.
In this sentence, "признаваться" conveys expressing or admitting feelings, specifically love.
Он признался в любви ей.
He confessed his love to her.
This usage of "признаваться" refers to acknowledging a fact or occurrence, often a lapse or omission.