This is the 3402nd most frequent Dutch word.
lippen
"Lippen" means "lips" in English.
Here, 'lippen' is used to reference the physical part of a person, i.e., the lips.
De zon streelde haar lippen zachtjes.
The sun gently touched her lips.
In this sentence, 'lippen' denotes an action involving lips, specifically the pursing of lips.
Hij bleef zijn lippen tuiten terwijl hij nadacht.
He kept pursing his lips while thinking.
Here, 'lippen' metaphorically expresses the appearance of lips during smiling.