соплёй перешибёшь

(кого)

груб.-прост., пренебр.

you'd think you could break him (her) in two (of a puny creature)

В слабой девочке таились железные силы: непонятно, откуда что бралось. За месяц обучения на плацу в конном и пешем строю она вытянулась, как струна, морозный ветер зарумянил лицо. "Поглядеть со стороны, - говорил Емельянов, - соплёй её перешибёшь, а ведь - чертёнок..." (А. Толстой, Гадюка) — In the young girl's fragile body there was much hidden strength. It was difficult to understand where it came from. After a month's training on the town square, she grew tall and straight as an arrow; the wind brought colour to her cheeks. 'At the first glance,' Yemelyanov would say, 'you'd think you could break her in two, but I wouldn't try - she's a little devil!'