let in on (verb) advise: offer information
Detalii: advise (verb) means 'to offer advice to or counsel'; advice (noun) is an opinion about what could or should be done about a situation or problem
Sinonime: contributed, donated, due, freewilled, gratuitous, honorary, unindemnified, unrecompensed, unremunerated, unrewarded, unsalaried,
voluntary, volunteer
Antonime: keep mum, keep quiet, keep secret