clamp

clamp 1

•  verb [T]

1    to hold something tightly in a particular position so that it does not move:
?clamp sth over/between/around etc: He clamped his hand over her mouth.
2    BrE to fasten a piece of equipment onto the wheel of a car that has been parked illegally, so that it cannot be moved; BOOT AmE
clamp down phrasal verb [I]
to become very strict in order to stop or limit something, especially criminal activity:
?clamp down on: The police are clamping down on drunk drivers.