to fall or trip ( synonym found)
Definition of to fall or trip:

°Any form of an element that has a distinctly different molecular structure to another form of the same element.
"Ozone (O3) is an allotrope of oxygen, normally O2"
Definition of to fall or trip:

°Any form of an element that has a distinctly different molecular structure to another form of the same element.
"Ozone (O3) is an allotrope of oxygen, normally O2"
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