Wiktionary
vb. (context transitive idiomatic English) To render smooth, to remove roughness from
Usage examples of "smooth down".
With another cup of coffee steaming close to hand, she blow-dried her hair, then used a dab of hair gloss to smooth down the flyaway tendrils.
As Katia refilled the lamp with the small pieces of amber that she kept in a cloth bag around her waist, Ash took the opportunity to smooth down her hair and rub her face.
I brushed at my wet checks, sniffed, and made an instinctive effort to smooth down my hair.
Her vagina clenched on the scant inches buried inside it, and though he refused to bury more of his length inside her, he allowed her hands to smooth down, over the tight muscles of his abdomen, lower to the damp width of his cock.
Who else knew how to smooth down the clean sheets and plump the feather pillows just so?
Cassandra slowed her pace as she neared the balcony, taking the time to smooth down her dress and adjust the braids in her hair.
She gripped the armrests on her chair against the impulse to smooth down her hair.
Then, practically and guiltily, they pulled apart, he to replace his breeches, she to adjust her bodice and smooth down the skirts.