B2 to become tighter or to make something become tighter, firmer, or less easy to move(使)变紧,(使)紧固
More examples
Carefully tighten the clamp until it firmly supports the pipette in a vertical position.
I tightened the knots and prepared to descend.
If we tighten the rope, it might reach across.
The dry atmosphere tightens my skin.
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