The raindrops drummed a rhythm on the windowsill.
Meaning: This means the raindrops were hitting the windowsill in a way that created a musical rhythm.
Choice of Words: Drummed means to hit something repeatedly to make a sound. Rhythm is a pattern of sounds in music. When you put them together, "Drummed a rhythm" describes the sound of raindrops hitting the windowsill in a regular, repeating pattern.
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