1
to be sufficient;to be enough
これだけの量の食料で一週間のキャンプに足りるでしょうか。
Will this much food do for a week's camping?
2
to be worth doing;to be worthy of;to deserve
in the form に足りる after a verb
See also:
取るに足りない (とるにたりない)
3
to do (the job);to serve;to answer