Here's what that means broken down:
* Rhythm: A pattern of sounds or movements that are regular and recurring. Think of the beat of a song or the pulse of your heart.
* Rhythmically: Describes something that happens or is done with this regular and recurring pattern.
Examples:
* "The waves crashed rhythmically against the shore." The waves are hitting the shore in a regular, repeating pattern.
* "She tapped her fingers rhythmically on the table." Her fingers are moving in a repeating pattern.
* "The dancers moved rhythmically to the music." The dancers are moving their bodies in a way that matches the beat and rhythm of the music.
In short, "rhythmically" suggests a sense of regularity, repetition, and flow in something's movement or action.