loosener
nounUK /ˈluːsənə/
US /ˈluːsənər/
A thing that makes something less tight or easier to move.
He used a loosener to open the stiff jar lid.
RELATED WORDS
OTHER MEANINGS
2. A warm-up exercise or activity that helps someone get ready for harder work.
The coach started practice with a few loosener drills.
3. A substance or agent that makes soil or material less compact.
The gardener added a soil loosener before planting seeds.
4. A person who makes something less strict or less severe.
The new manager was seen as a loosener of the old rules.