Lose out to
Definition 1 of 2
Pro Tip 1/3Context Matters
Understand the scenario to grasp 'lose out to'; it's often used in competitive situations like sports or business. 
She trained hard but lost out to the reigning champion in the finals.
Pro Tip 2/3Emotional Weight
The phrase can imply disappointment or regret, especially when the effort involved doesn't lead to success. 
After years of development, their tech startup lost out to a larger corporation.
Pro Tip 3/3Not Always Negative
'Lose out to' doesn't always suggest failure; sometimes it's about a strong opponent winning fairly. 
He lost out to a better skilled player, which motivated him to improve.