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to fold up
[phrase form: fold]
01
to bend something to make it smaller or more compact
Examples
He carefully folded up the letter before placing it in the envelope.
When you're done with the map, fold it up neatly and return it to the glove compartment.
02
to become smaller or more compact by bending or collapsing
Examples
The map easily folds up when not in use.
If you 're not careful, the umbrella can suddenly fold up in the wind.
