语境：不经意间把朋友准备求婚的事说出来了。
关联阅读：“套别人的话”“嘴巴严实”“大嘴巴”用英语怎么说？
I blurted out his proposal plan before he could stop me.
blurt /blɜːt/ sth. out表示to say something suddenly and without thinking，突然想都没想就说出某话，脱口而出，一般是因为紧张或激动。proposal /prə'pəʊzl/ 名词，“提议；求婚”。
I was so excited that I spilled the beans about the surprise proposal to her sister.
spill the beans 俚语，表示to tell something that someone else wanted you to keep a secret，泄露别人希望你能保守的秘密。
I let it slip that he was going to propose without thinking.
let sth. slip表示to tell people about something without intending to，把秘密或者重要信息说漏嘴了。slip /slɪp/ 动词，“滑脱，溜走”。
I was so excited; I let the cat out of the bag about his proposal plan to her sister.
let the cat out of the bag 俚语，表示to accidentally reveal a secret，无意中泄露秘密。
I gave away his proposal plan while chatting with her sister.
give away sth. 可以表示to tell people something secret, often without intending to，不经意间把秘密告诉了别人。
I gave the game away about the proposal when I mentioned the ring box.
give the game away 俚语，表示to spoil a surprise or secret by doing or saying something that lets someone guess what the secret is，说漏嘴，让别人提前知道或者猜到了秘密，制造不了惊喜了。
I inadvertently/accidentally disclosed/revealed his proposal plan during our conversation.
reveal /rɪ'viːl/, disclose /dɪs'kləʊz/ 动词，“揭露、披露 (秘密)”；inadvertently /ˌɪnəd'vɜːtntli/, accidentally /ˌæksɪ'dentəli/ 副词，“无意地，不经意地”。这一句里的表达比较书面和正式，一般不用于日常口语。
根据首字母补充单词，选中文本可查看答案。
I blurted out his proposal plan before he could stop me.
I was so excited that I spilled the beans about the proposal plan to her sister.
I let it slip that he was going to propose without thinking.
I was so excited; I let the cat out of the bag about his proposal plan to her sister.
I gave away his proposal plan while chatting with her sister.
I gave the game away about the proposal when I mentioned the ring box.
I inadvertently/accidentally
disclosed/revealed his proposal plan during our conversation.
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推文说明：
这系列推文主要分享那些中文里常说、换成英语就不太会讲的话。每天早晨8点更新。