to be pregnant
to be expecting a baby
After trying for a baby for several years, Mark was happy when his wife told him she had a bun in the oven.
Throwing a baby shower is one of the best ways to announce that you have a bun in the oven.
She was happy to announce to her parents that they would soon be grandparents as she had a bun in the oven.
After running numerous tests, the doctor was happy to tell Mary that she wasn’t sick but that she had a bun in the oven.
After experiencing some bouts of morning sickness, Kate began to suspect that she might have a bun in the oven.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.