Fall short of something
Definition 1 of 2
Pro Tip 1/3Unmet Goals
Use when someone tries but fails to achieve something important. 
He fell short of the university's admission requirements.
Pro Tip 2/3Measured Effort
Suggests trying but not succeeding enough to fulfill a specific aim. 
The campaign fell short of its voter turnout expectations.
Pro Tip 3/3Subtle Disappointment
Carries an implication of slight disappointment or inadequacy. 
Her performance fell short of her usual standards.