crool means to murmur or mutter. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
crool is pronounced /kɹuːl/.
verb
- To murmur or mutter.“I […] lay down to rest / Upon a grassy hillock, o'er which bowed / A bush in which some late bird kept her nest. / And, as she crooled, I slept.”