1.
If a part of your body seizes up , it suddenly stops working, because you have strained it or because you are getting old.
We are all born flexible but as we grow older, we tend to seize up a little.
PHRASAL VERB : V P
2.
If something such as an engine seizes up , it stops working, because it has not been properly cared for.
She put diesel fuel, instead of petrol, into the tank causing the motor to seize up.
PHRASAL VERB : V P