From Longman Dictionary of Contemporary Englishlike an ovenlike an oveninformalHOT uncomfortably hot → have a bun in the oven at bun(5) → oven
Examples from the Corpus
like an oven• The heat of the day made the gymnasium feel like an oven.• The room is like an oven already.• Makes it like an oven, spoiling the negatives.• I wish they'd turn off the heat. It's like an oven in here.• It's like an oven in here. Let's open some windows. 