Að ganga með grasið í skónum

Literally: To walk with the grass in your shoes

Example: “Hann hefur gengið með grasið í skónum á eftir henni í allt sumar.” — He's had a thing for her all summer.

English equivalent: To have a thing for someone

Origin: Cleasby and Vigfusson's Icelandic-English Dictionary records ganga eftir einhverjum með grasið í skónum, "to go after someone with grass in one's shoes," for pleading humbly with someone. Today it means pursuing someone persistently, above all courting them, as if one had walked to their door so often that the grass stuck in one's shoes. Why grass is not documented.