expression, suru verb (irregular)
approve of; consider right; give one's approval to
A somewhat formal expression meaning to judge something as correct or acceptable. Often used in contexts of moral judgment, policy, or official approval. The する part conjugates as a suru verb.
彼の提案を是とすることはできなかった。
I could not approve of his proposal.
委員会はその計
The committee gave its approval to the plan.