in ‧ gra ‧ ti ‧ ate /ɪnˈɡreɪʃieɪt/ BrE AmE verb
[ Date: 1600-1700 ; Language: Latin ; Origin: gratia 'grace' ]
ingratiate yourself (with somebody) to try very hard to get someone’s approval – used to show disapproval ⇨ flatter :
His policy is to ingratiate himself with anyone who might be useful to him.