under (one's) wing
In the state of being protected, tutored, nurtured, or cared for by one; in one's care. I was nervous starting an internship at my uncle's company, but it definitely made it easier being under his wing. Our parents died when we were quite young, so my aunt took us under her wing.
*under someone's wing(s)
Fig. receiving someone's care and nurturing. (*Typically: get someone ~; have some-one ~; take someone ~.) John wasn't doing well in geometry until the teacher took him under her wing. I had a number of the new workers under my wing for a few weeks.
under (one's) wing
Under one's protection; in one's care.