"keep echoing" is a correct and usable phrase in written English.
It can be used in a variety of contexts, but common usage includes describing a sound or action that continues to repeat or resound. Example: The sound of the church bells kept echoing through the valley, signaling the start of the wedding ceremony.
The word kept echoing in quick-step cadence through his head without meaning anything.
The day keeps echoing around her. Everything is priceless, she thinks.
A passage at the beginning of Thomas Mann's "Death in Venice" keeps echoing in my mind.
That word kept echoing through the courtrooms all through the morning: forever.
Now that "just like in the old days" keeps echoing in my mind, and I suddenly see this whole conflict with Lebanon in a completely different light.
But connecting was hard: Beto's voice kept echoing through the car speakers, and at times he couldn't hear Amy over his own voice.
As I prowled Gramercy Park and the Flatiron district on Thursday night, the refrain of a new John Hiatt song kept echoing in my head: "Thank God the Tiki Bar is open".
The relative quiet was occasionally broken with a splash of music from someone's laptop, usually glitching out and quickly muted, and one corner of Hacking Room 1 kept echoing the sound of Darth Vader's now-infamous "nooooooooo!" clip as, presumably, someone's hack stopped working.
The hills and lochs of Scotland are an unlikely place to recall the words of India's first prime minister, Jawaharlal Nehru, but they kept echoing in my head last week as I headed west from Glasgow: "A moment comes, which comes but rarely in history, when we step out from the old to the new, when an age ends, and when the soul of a nation, long suppressed, finds utterance".
It kept echoing as it leaped from one neural synapse to another.
