be at one with (someone or something)

1. To be in agreement with someone or something. They need to be at one with each other when they choose their wedding date. No progress can be made on the proposal unless all of the trustees are at one with each other. Yes, I'm at one with Marcus on this—Catherine's the candidate we should hire.

2. To be or feel very connected to or in harmony with someone or something. When I meditate, I feel like I am at one with the universe. I love looking up at the stars at night. It makes me feel like I'm at one with the universe or something. Date nights are a must. They help me to feel like I'm at one with my husband amid the hustle and bustle of life.