Definition of buoyancy aid in English:
A sleeveless jacket lined with buoyant material, worn for water sports.
- My advice is to wear a buoyancy aid and take a wading staff.
- Realise I forgot to pack my buoyancy aid so have to scrounge one.
- It's a big river where you need a good strong wading staff, a buoyancy aid and chest high waders to reap the river's rich rewards.