To buy something for someone and give it to them; to purchase an item as a gift or provision for another person.
母は子どもたちに冬用のコートを買い与えた。
The mother bought winter coats for her children.
会社が新入社員にパソコンを買い与えた。
The company provided new employees with computers (bought and gave them).
親は子に玩具を買い与えることがある。
Parents sometimes buy toys for their children.