To be sufficient; to be enough to meet a need or requirement.
これで人数は足りるでしょうか。
Will this be enough for the number of people?
時間は十分に足りるから、急ぐ必要はない。
We have plenty of time, so there's no need to hurry.
To be worth doing or worthy of something; used in the form 〜に足りる to indicate that something merits attention or has worth.
彼の行動は信用に足るものだ。
His actions are worthy of trust.
その証拠は告発に足りないと判断された（取るに足りない）。
The evidence was judged insufficient to support an accusation (not worth taking up).
To serve the purpose; to do the job; to answer (a purpose or need).
この簡単な説明で用は足りると思います。
I think this brief explanation will suffice.
試験のための準備としてはこれで足りるか確認しよう。
Let's check whether this is enough preparation for the exam.