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under (someone's) wing
Protected, tutored, nurtured, or cared for by someone. 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 sister and I were under our grandmother's wing for most of our lives.
*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.