to meet a need; to be enough
A brief note will suffice
archaic to be enough for (somebody or something)
suffice (it) to say
used to indicate that further information has been withheld, e.g. for the sake of brevity or discretion
Suffice it to say he has resigned
[Middle English sufficen via French from Latin sufficere to put under, meet the need of, from sub- + facere to make, do]