Verb (5-dan, つ, intransitive)
1. to stand up straight; to stick up (e.g. of hair); to stand (e.g. of a tree)
丘の上に古い電柱が一本突っ立っている。A single old utility pole stands on top of the hill.
2. to stand up abruptly; to jump to one's feet
3. to stand (doing nothing); to stand around
なぜ私は突っ立ってるんだろう。Why am I just standing here?