To keep within bounds

not to exceed or pass beyond assigned limits; to act with propriety or discretion.

See also: Bound

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
'All of this is to ensure to keep within bounds. And with the Chinese now taking the position, it's possible to business that we downsize to an appropriate level that will be supported by the market that is available,' said Sta.
Raps his shoe on the table, he's harder to keep within bounds. What
It can't take frost so needs winter protection but even full grown in the wild only reaches about 6ft so is easy to keep within bounds. It is a bush with a spreading, weeping habit which can look very attractive in a pot.