背伸び
JLPT N1 · Nounせのび(senobi)声调 1
standing on tiptoe and stretching one's back to make oneself taller; stretching oneself; overreaching oneself; overstretching oneself; trying to do something beyond one's ability
分からないのに、背伸びをして、バレエを見に行ったりする。— Despite knowing nothing about it, I showed off by going to the ballet.