足(た)りるto be sufficient, to be enough, to be worth doing, to be worthy, to be sufficient, to answer, to do

その財布(さいふ)を買(か)うには二(に)万(まん)円(えん)で足(た)りるかな？

Would 20,000 yen be enough to buy that purse?

戦争(せんそう)に勝(か)つためにはこの数(かず)の兵士(へいし)では足(た)りません。

This number of soldiers is not enough to win the war.

こんな沢山(たくさん)の水(みず)があれば当分(とうぶん)は買(か)わなくても足(た)りるだろう。

With this much water, we will have enough for the time being even without buying any.

あと二(に)十(じゅう)円(えん)足(た)りなかったばっかりに、そのケーキを買(か)う事(こと)が出来(でき)ませんでした。

I couldn't buy the cake because I didn't have enough by 20 yen.

彼女(かのじょ)はちょっと頭(あたま)が足(た)りないので、重要(じゅうよう)な任務(にんむ)を任(まか)せる事(こと)は不可能(ふかのう)だろうなぁ…。

Since she is a bit short on brains, it would be impossible to entrust her with important tasks...