Sixfold means six times as much or six times as many.
Sixfold is a way to talk about things that are six times bigger or more.
Examples:
She has sixfold more toys than I do.
The cake recipe makes a sixfold amount of cake.
The tree is sixfold taller than the flower.
I have sixfold as many friends as you do!
The giant's steps were sixfold bigger than mine.
The snow was sixfold deeper than I thought it would be.