No, it isn't correct. What is the exact sentence that you found in the dictionary?
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AnonymousWe all supposed that way (e.g. the left one) to take at the next rundabout?It is not a question.
Anonymousyes I made there a little mistake, but it is not the case.You sentence (copied below) is not grammatically correct.
Anonymous2. Did we suppose him to be German?OK
Anonymous3. Do we suppose him to eat a lot?No.