to  reckon  without  somebody or something
reckon
rɛkən
rekēn
without
wɪðaʊt
vidhawt
somebody or something
[reckon] without {one's} host

Definition & Meaning of "reckon without somebody or something "in English

to reckon without somebody or something
01

to not consider a thing or person while planning and fail to prepare a way to deal with them as a result 

to [reckon] without {sb/sth} definition and meaning
Idiom
Informal

What is the origin of the idiom "reckon without somebody or something" and when to use it?

The origin of the idiom "reckon without somebody or something" is not precisely documented, but it has been in use since the 19th century. It likely developed as a figurative expression from the more literal use of "reckon" (meaning to calculate or consider) in the context of making predictions, assumptions, or plans. It is still used in both formal and informal contexts to caution against overlooking important elements in decision-making.

Examples
They reckoned without the weather, and the outdoor launch was a disaster. 
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