English Thesaurus
(verb) 
Definition
to divulge (secrets) indiscreetly
She'll blab it all over the school.
Synonyms
tell
The facts tell a very different story.
,
reveal
She has refused to reveal her daughter's whereabouts.
,
disclose
Neither side would disclose details of the transaction.
,
divulge
He was charged with divulging state secrets.
,
blurt out
,
give away
,
let slip
,
blow wide open (slang)
(verb) 
Definition
to divulge (secrets) indiscreetly
Don't blab about your plans until you are ready to make an announcement.
Synonyms
tell all
,
tell
The children know who they are, but they are not telling.
, ,
spill the beans (informal)
He was ready to spill the beans about the whole affair.
,
sing (slang, mainly US)
, ,
open your mouth
,
let the cat out of the bag
,
blow the gaff (British, slang)
,
spill your guts (slang)

Additional synonyms

in the sense of disclose
Definition
to make (information) known
Neither side would disclose details of the transaction.
Synonyms
make known,
make public,
out (informal),
let slip,
spill the beans about (informal),
cough (slang),
blow wide open (slang),
get off your chest (informal),
spill your guts about (slang)
in the sense of divulge
Definition
to make known
He was charged with divulging state secrets.
Synonyms
make known,
spill (informal),
let slip,
blow wide open (slang),
get off your chest (informal),
cough (slang),
out (informal),
spill your guts about (slang)
in the sense of reveal
Definition
to disclose or divulge (a secret)
She has refused to reveal her daughter's whereabouts.
Synonyms
make known,
give away,
make public,
give out,
let out,
let slip,
take the wraps off (informal),
blow wide open (slang),
get off your chest (informal)

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Source

Thesaurus for blab from the Collins English Thesaurus
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