under someone's wing
Guided or protected by someone, as in The department head asked Bill to take Joe under his wing during his first few weeks with the firm. This metaphoric term alludes to the mother hen sheltering her chicks. [1200s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.