godan verb (-mu)
borrow; take out a loan
Implies borrowing a substantial amount or taking on debt, often with a nuance of borrowing more than one should or getting in over one's head. The 込む suffix adds a sense of 'into' or 'thoroughly'.
彼は車を買うために銀行から金を借り込んだ。
He borrowed money from the bank to buy a car.
あちこちから
I borrowed from all over and ended up unable to pay it back.