your guess is as good as mine
simple past tense and past participle of sib
(idiomatic) I don't know; I have no idea.
(mathematics) Ellipsis of sinc function. ( f = sin(x)/x) / (engineering) Ellipsis of sinc function. ( f = sin(pi*x)/(pi*x))
(archaic) second-person singular simple present form of circle
修理にどれくらい時間がかかるか尋ねると、彼女は肩をすくめて「私にはさっぱりわかりません」と言った。
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