if [someone] doesn't finish, if [someone] doesn't get done
戦時中はしばしば砂糖無しで済まさなければならなかった。
During the war, we often had to make do without sugar.
もしお金がないのなら、なしで済まさなければならない。
If you don't have any money, you'll have to make do without it.
私たちは今年は休日なしで済まさなければならないようだ。
It looks like we'll have to get by without a vacation this year.