expression, ichidan verb
serve the purpose; do the job; suffice
Used when something is sufficient or adequate for a particular need or task. Often implies that the thing is not ideal but gets the job done.
この道具で用が足りるなら、新しいのを買わなくてもいい。
If this tool does the job, we don't need to buy a new one.
簡
I think a simple explanation will suffice.