godan verb (-tsu), intransitive verb
stand up straight; stick up; stand tall
Describes something standing upright or sticking up, often with a sense of being rigid or prominent. Used for people, hair, trees, etc.
彼は背筋を伸ばして突っ立っていた。
He stood up straight with his back stretched.
寝癖で髪の毛
My hair is sticking up from bedhead.
godan verb (-tsu), intransitive verb
jump to one's feet; stand up abruptly
Emphasizes a sudden, sharp movement to a standing position, often from a sitting or lying state.
驚いて椅子から突っ立った。
Surprised, I jumped to my feet from the chair.
godan verb (-tsu), intransitive verb
stand around; stand idly
Often carries a nuance of standing without purpose or doing nothing, sometimes with a negative connotation of being in the way.
道の真ん中に突っ立ってないで、どいてください。
Don't just stand in the middle of the road; please move.