0 to become tighter or to make something become tighter, firmer, or less easy to move -- （使）变紧，（使）紧固
Carefully tighten the clamp until it firmly supports the pipette in a vertical position.
The dry atmosphere tightens my skin.
To this end, he tightened the economic embargo by making travel more difficult.
As clearly put, tightening the belts and wages of workers while loosening the market forces is a recipe for mismatch and discontent.
The government progressively tightened up the conscription process to stamp out such fraud.
In the course of time the definition of the child care guarantee was tightened.
