Meaning of -FOLD in English
-fold /fəʊld $ foʊld/ AmE suffix
[ Language: Old English ; Origin: -feald ]
1 . [in adjectives] of a particular number of kinds:
The government’s role in health care is twofold: first, to provide the resources and, second, to make them work better for patients.
2 . [in adverbs] a particular number of times:
The value of the house has increased fourfold (=it is now worth four times as much as before) .
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012