To avoid/ignore/not notice the main part of a conversation, topic ect.
Originating from presumably by someone putting away shopping, and a loaf of bread falls out the bag and to the floor. But the person does not notice it/ignores it and continues to put away the shopping.
"Don't leave the bread on the floor."
"Well sorry I left the bread on the floor."
"I'm afraid you left the bread on the floor."
"Are you leaving the bread on the floor?"
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