Smudge

The boundaries between countries often smudge in areas where the terrain is difficult to define.

The distinction between real and fake news can sometimes smudge in the era of social media.

The rules of grammar can sometimes smudge when writing creative fiction.

The painter accidentally made a smudge on the canvas.

The car's windshield had a large smudge that obstructed the driver's view.

He wiped the smudge off his glasses with a cloth.

The little girl had a smudge of chocolate on her face.

She noticed a smudge on her shirt and quickly wiped it away.

The teacher marked the paper with a smudge to indicate that it needed improvement.

The smudge on the car window was from the exhaust of a passing vehicle.

She used a smudge to blend the colors on the canvas.