しゃべshaberu
1.

To engage in conversation by expressing thoughts and ideas verbally, often in a casual or informal manner.

2.

To speak in a manner that is characterized by talkativeness or an abundance of words, typically without a focus on serious or important topics.

3.

To convey information or narratives through speech, sometimes used in a self-deprecating context when discussing speaking engagements or lectures.

Example:

つい彼が病気だということをしゃべってしまった。