to such an extent (usually followed by as): I will do the work insofar as I am able.
Origin of insofar
First recorded in 1590–1600; orig. phrase in so far
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
see inasmuch as, def. 2.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.