身軽
Meanings
Na-adjective
1. agile; nimble; light (of foot)
2. casual (clothing); light (e.g. luggage)
3. carefree; with limited responsibility
Other spellings
身がる
Kanji used
Pitch accent
みがる
Examples1
捕らえる
It's apparently a metaphor for something uncatchable, light of body and fleet of foot.