Learn what "one never knows when they might need it" means, when people say it, and how to use it naturally in English.

This means something could be useful in the future even if it is not needed now.
From In Her Shadow, Episode 20
Someone is justifying keeping something because it may be useful later.
Use it to explain why you are keeping an item or information. It sounds a bit formal or old-fashioned in everyday conversation.
Scenes unlock real expressions as you watch
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