This is the 470th most frequent Hungarian word.
derült
"Derült" means "clear" or "cloudless" (usually referring to the weather).
'derült' here describes the condition of the sky, meaning 'clear, cloudless'.
Az ég ma reggel derült volt.
The sky was clear this morning.
'derült' here is part of the phrase 'derül ki', meaning 'turns out' or 'becomes evident'.
A helyzet gyorsan derült ki.
The situation quickly became clear.
'derült' here describes the smile, meaning 'serene' or 'calm'.