come again? what did you say again? (asking the listener to repeat what was said) / what!? (expressing disbelief and shock)

Used with uncertain information. / no matter the circumstances

Used other than figuratively or idiomatically: see なん, でも.

(more informal) Alternative form of なのだ (na no da)

Used in reproach. / Used in relief.

documents

authority, expert, connoisseur

pass through something / pass a test / pass a bill / pass a screening

thrilling

a kick, a thrill