ichidan verb, transitive verb
replace by buying new; buy a replacement
Used when you discard or sell an old item and purchase a new one to take its place. The object is the old item or the category of item being replaced.
古いスマホを新しい機種に買い換えた。
I replaced my old smartphone with a new model.
車を買い換えるかどうか迷って
I'm hesitating about whether to replace my car.