(1) unbosom oneself to (sb.)意为“向(某人)吐露心迹(事)”。

• At last she decided to unbosom herself to her mother, and share her secret sorrow.
  最后她决定向母亲吐露心迹，让她分担她内心的悲伤。
• He unbosomed himself to me about his family troubles.
  他向我吐露了他家里的烦心事。

 (2) unburden oneself/one's heart to sb.意思为“向某人倾诉衷肠”，与unbosom oneself to sb.意思相同，可以互换。

• He unburdened himself (his heart ) to me about his troubles.
  他向我倾诉他的烦心事。

＊倾诉的内容也可用介词of引出。

• I feel I want to unburden myself of the guilt for what I did so many years ago.
  现在我想把对自己多年前所做之事的内疚之情向人倾诉出来。

 (3) unload on/upon (sb.)意为“向(某人)发泄(怒气)；向(某人)倾诉(心事、烦恼)等”。

• You shouldn't unload your anger on me.
  你不应该冲我发泄你的怒气。
• You can always unload your troubles on the priest, he's there to listen.
  你总是可以向牧师倾诉你的困扰，他随时准备倾听。

 (4) open one's heart to (sb.)意为“向(某人)讲心里话；同情(某人)”。

• Mary felt much better after she opened her heart to her mother.
  对母亲讲了心里话，玛丽感觉好多了。
• Mrs. Smith always opened her heart to the poor.
  史密斯太太总是同情穷人。