Synonyms of 'smudge'
to make or become smeared or soiledSmudge the outline using a cotton-wool bud.
to make or become smeared or soiledShe kissed me, careful not to smudge me with her fresh lipstick.
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in the sense of blot
a stain or spot, esp. of inkan ink blot
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Thesaurus for smudge from the Collins English Thesaurus