verb To spread (a substance, especially one that colours or is dirty) across a surface by rubbing.
The artist smeared paint over the canvas in broad strokes.
verb To cover (a surface with a layer of some substance) by rubbing.
She smeared her lips with lipstick.
verb To make something dirty.
verb To make a surface dirty by covering it.
verb To damage someone's reputation by slandering, misrepresenting, or otherwise making false accusations about them, their statements, or their actions.
The opposition party attempted to smear the candidate by spreading incorrect and unverifiable rumors about their personal behavior.
verb To cause (something) to be messy or not clear by rubbing and spreading it.
verb To become messy or not clear by being spread.
The paint is still wet — don't touch it or it will smear.
verb To write or draw (something) by spreading a substance on a surface.