At a Loss
Definition:Not knowing what to do.
My wife came into the dining room and shouted at me. “What have you been doing?” I didn’t know what she was talking about. I was at a loss for words. I didn’t know what to say. She held out a gold ring and said, “I found this under the bed. I want to know who’s been in our room.” She was very angry. I said, “Have you forgotten? It’s your birthday today. I hid the ring under the bed. I was going to give it to you tonight at dinner. Happy birthday darling!” She stared at me with her mouth open. She was completely at a loss