to fail to consider someone or something important in your plans
to forget to think about something that changes everything
One main meaning — here's how to use it.
to make plans or assumptions without considering an important person, fact, or difficulty
"They thought the deal would go through easily, but they reckoned without local resistance."
He had reckoned without his host.
— Arthur Conan Doyle, Sherlock Holmes stories
to calculate while leaving something outside
to forget to think about something that changes everything
Most often used in the pattern 'reckon without someone/something'. It is fairly literary and often appears in dramatic contexts.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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