From Longman Dictionary of Contemporary Englishgive somebody a leg-upgive somebody a leg-upinformal a) UPto help someone to get up to a high place by joining your hands together so they can use them as a step b) British EnglishHELP to help someone succeed in their job → leg-up
Examples from the Corpus
give somebody a leg-up• Joining the Visa network would give it the leg-up it needs. 