Godan verb with 'mu' ending, Transitive verb
to invest in; to sink money into; to put into; to lay out (funds); to inject; to impregnate; to infuse; to instill; to implant; to imbue; to focus (attention, efforts)
その学者はなけなしの金を全部本につぎこんだ。The scholar spent what little money he had on books.
Also written 注ぎ込む【つぎこむ】