Overhear

I didn't mean to eavesdrop, but I did overhear you.

How charmed I am when I overhear a German word which I understand!

I didn't want Tom to overhear our conversation.

I couldn't help but overhear what you said to Tom.

I couldn't help but overhear your conversation.

I couldn't help but overhear your conversation with Tom.

I can't talk to you here. Someone might overhear us.

Mary left the door ajar and Tom could overhear what she was saying.

Tom put his ear to the door in an effort to overhear what Mary was saying on the phone.

Tom and Mary were speaking loud enough for John to overhear them.