プログレッシブ和英中辞典(第4版)の解説
のこのこ
〔何気なく〕nonchalantly [n&scripta_grave;nʃəl&scripta_acute;ːntli|n&openo_acute;nʃələnt-]；〔平然と〕coolly
何も知らずにのこのこ（と）彼女の前まで行った
He sauntered right over to her without knowing the situation.
食事時になると必ずのこのこ現れる
He always wanders [《米》 moseys] in at mealtime.
真夜中にのこのこ（と）訪ねて行けるものか
Do you think I can just wander over nonchalantly and call on him in the middle of the night?