Definition
to cause an object or situation to become more secure, firm, or reduced in mobility
使其更緊、更牢固
We need to tighten this device up a bit more before we start the next phase.
我們需要把這個設備再收緊一點，然後才能開始下一階段。
He told me that we must tighten the policy up to avoid any problems in the future.
他告訴我，我們必須收緊政策，以避免將來出現任何問題。
To prevent accidents, please make sure all the screws are tightened up.
為了防止事故，請確保所有螺絲都已收緊。