From Longman Dictionary of Contemporary Englishunburdenun‧bur‧den /ˌʌnˈbɜːdn $ -ɜːr-/ verb [transitive] → unburden yourself (to somebody)→ See Verb table
Examples from the Corpus
unburden• It was as if Jack was preparing to unburden himself, to share his secrets with her.• He had been feeling guilty and needed to unburden himself.• Nevertheless, I feel the need to unburden myself in print. 