ponerse las pilas

Literally, “put one's batteries in”.

ponerse las pilas (first-person singular present me pongo las pilas, first-person singular preterite me puse las pilas, past participle puesto las pilas)

1. (idiomatic, colloquial) to pull up one's socks; to pull one's socks up
2. (idiomatic, colloquial) to get one's act together
   • 2019 December 6, Juan Sanguino, quoting Kristen Stewart, “Cómo Kristen Stewart superó el desprecio del público para convertirse en la estrella más libre de Hollywood”, in El País‎^[1], Madrid, →ISSN:

     No estaba preparada. Me pilló desprevenida y la gente se puso furiosa, me consideraban un fraude. Me decían: ‘Ponte las pilas o retírate del negocio’”.

     I was not prepared. I was caught off guard, people were furious and considered me a fraud. They told me: ‘Get your act together or retire from business.’”

• “ponerse alguien las pilas”, in Diccionario de la lengua española (in Spanish), online version 23.7, Royal Spanish Academy, 2023 November 28