This is the 9835th most frequent Japanese word.
見当
"見当" (けんとう) means "approximation," "estimate," or "guess."
The word '見当' here is used to signify an estimation or conjecture, indicating uncertainty about the correctness of a statement.
彼の言葉が正しいかどうか見当がつかない。
I cannot estimate whether his words are correct.
In this sentence, '見当' refers to forming an approximate idea or estimation about the distance.
次の駅までの距離は見当をつけて何キロぐらいと思う？
Can you estimate the distance to the next station as to how many kilometers it is?
'見当' is used here to describe one's expectation or estimate, which turned out to be incorrect.