[以卵击石 / 以卵擊石, yǐ luǎn jī shíㄧˇ ㄌㄨㄢˇ ㄐㄧ ㄕˊ] lit. to strike a stone with egg (成语 saw); to attempt the impossible; to invite disaster by overreaching oneself#86738
[せのび, senobi] (n, vs) (1) standing on tiptoe and stretching one's back to make oneself taller; stretching oneself; (2) overreaching oneself; overstretching oneself; trying to do something beyond one's ability; pushing to the limit