プログレッシブ和英中辞典(第4版)の解説
ふと
〔突然〕suddenly；〔偶然〕by chance；〔不意に〕unexpectedly
ふと立ち止まる
stop suddenly
彼にふと出会った
I happened to meet him.／《口》 I ran [bumped] into him by chance.
その考えがふと思い浮かんだ
That idea 「crossed my mind [occurred to me].
彼とはふとしたことから知り合った
I got acquainted with him by chance.
ふとした出来心で盗みを働いた
He committed theft on impulse.／He stole impulsively.