Hurting a joint by stretching it too much.
Spraining usually means pain and needing to rest the hurt joint.
Examples:
I am spraining my ankle.
She is spraining her wrist.
He is spraining his knee while playing.
We are always spraining our ankles when we play soccer.
She is always spraining her ankle, it's like she can't walk!
I am spraining my ankle again, it's like I always do this!