To bring (oneself) into an erect posture, often as an expression of dignity or indignation.

使（自己）来到一个直立的姿势，通常用于表示尊严或愤怒。

youdao

Inflorescences 20 – 40 cm long, 1 – 1.5 cm thick, often marbled, at first spreading, later erect, bracts many in a loose rosette, smaller than in the main rosette but of the same colour;

花序花茎20 - 40厘米长，1 - 1.5厘米厚，大理石纹路，先外展，而后直立，若干苞片着生在一个小型松散莲座中，此花茎莲座较主叶面莲座小，但颜色一致；

youdao

Their ears were often floppy rather than erect.

FORBES: The Fossils in Our Genes