Region: US | Usage example: After the good news, she had pep in her step all afternoon.

Pep in your step

Meaning

A lively, energetic stride.

Compliments someone feeling upbeat and confident.

Origin notes can vary by region and source; this page gives the commonly reported explanation and usage context.

Pep stands for peppy energy, often used for lively movement.

Mid-20th century idiom from upbeat radio and dance culture.