Meaning of gain momentum | Babel Free

Definitions

1. To increase something's own speed while being acted on by gravity.
   literally
2. Synonym of gain ground (to further the progress of; to obtain an advantage)
   idiomatic
3. To become popular among a large amount of people; to have many people participate in a trend or social movement.
   idiomatic

Examples

“The pilgrimage has gained momentum!”

CEFR level