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つかん

can't figure out, can't tell

→ 付く
verb · informal Rare #40,787
can't figure out, can't tell Colloquial contraction of つかない, used in expressions such as 見当がつかん (have no idea).
JA: どこにあるのか見当がつかん。
EN: I have no idea where it is.
Conjugation of 付く
Potential
つかん

見当もつかんよ

I haven't got the slightest idea.

— グッドフェローズ (1990)

見分けがつかん

I can't tell them apart.

— インディ・ジョーンズ／最後の聖戦 (1989)

それでどうもその原因がさっぱり見当がつかんもんですからいや

So I just can’t for the life of me figure out what caused it.

— 生きる (1952)