突(つ)っ立(た)つto stick up (hair, etc.), to stand up straight, to stand up abruptly, to jump to one's feet, to stand in one place, doing nothing in particular, to stand around, to stand flat-footed

辞書の定義

「つ」で終わる五段動詞, 自動詞
1.
to stand up straight, to stick up (e.g. of hair), to stand (e.g. of a tree)
「つ」で終わる五段動詞, 自動詞
2.
to stand up abruptly, to jump to one's feet
「つ」で終わる五段動詞, 自動詞
3.
to stand (doing nothing), to stand around