best plan; best policy
Refers to the most effective or wisest course of action in a given situation. Often used in formal or strategic contexts.
The best plan now is to wait without acting.
He thought that speaking honestly was the best policy.
Compound of 上 (じょう, 'upper, best') and 策 (さく, 'plan, policy'). The exact historical derivation is uncertain, but the meaning follows directly from the kanji.