(informal)say something that one has wanted to say for a long time, resulting in a feeling of relief
(非正式)将（心事）一吐为快
(或 北美 vest)(informal)be extremely secretive and cautious about one's intentions
(非正式)极端谨慎地保守私密，对想法秘而不宣
To vent one's pent-up feelings.
发泄被压抑的感情