undersay

verb

1. To say by way of derogation or contradiction.“They say, they con to heaven the highway; But by my soul I dare undersay, They never set foot on that same troad, But balke their right way, and strayen abroad.”
2. To understate.“My words undersay it, of course; I mean something rarer than critical, something better than ethical, and perhaps I had better retreat upon such a word as spiritual.”