Definitions

1. verb

to flow back; to flow with a current, as a river, so as to form a lake or a pool at its lower end, or to flow in a wave-like or undulating motion.

“The river aestuates into a calm lake at its mouth.”

2. verb

to flow in or as if in a wave, especially so as to form a wave-like or undulating motion.

“The wind aestuates through the forest, making the trees sway gently.”