To be enough or sufficient; to meet the need (of anything); to be equal to the end proposed; to be adequate
Two capsules of fish oil a day suffices.
be sufficient; be adequate, either in quality or quantity; "A few words would answer"; "This car suits my purpose well"; "Will $100 do?"; "A 'B' grade doesn't suffice to get me into medical school"; "Nothing else will serve"
Suffice it to say or suffice to say is used at the beginning of a statement to indicate that what you are saying is obvious, or that you will only give a short explanation. Suffice it to say that afterwards we never met again
If you say that something will suffice, you mean it will be enough to achieve a purpose or to fulfil a need. A cover letter should never exceed one page; often a far shorter letter will suffice. = do