默默
mòmò · HSK 4
quietly
🤫 默 = silent; doubled 默默 intensifies to 'silently, without a word'
默 means silent or tacit (dog 犬 + black 黑, the dog stays dark and quiet). Chinese often doubles a character to soften or intensify an adverb, so 默默 = doing something silently, without speaking up.