Verb > Smudge

Verb – Smudge

1 (+ object) : to make a dirty mark, spot, streak, etc., on (something)

Don’t smudge the picture with your dirty hands!

His face was smudged with grease.

2 a (no object) : to become blurry and unclear by being touched or rubbed

Charcoal drawings smudge easily.

2 b (+ object) : to make (something) blurry or unclear by touching or rubbing it

Be careful not to smudge (=smear) the ink.