to talk foolishly

gossip

to tell e.g. a secret suddenly and without deciding to

utter suddenly

to say or admit (that one has done wrong)

admit, confirm

to make (something) known

reveal, make public

to make known (a secret)

make known; confess

to tell (a story)

give an account of

that causes something to be known; a person who tells about another's private affairs, makes known a secret etc

gossip; tell rumor