laughline

laugh·line

or laugh line  (lăf′līn′, läf′-)
n.
1. A lasting wrinkle formed at the outer corner of the eye or along the side of the mouth, especially noticeable when one laughs or smiles.
2. A line of dialogue intended to cause laughter: "actors who are directed ... to cutely underline every nuance and laughline" (Laurie Winer).

laughline

(ˈlɑːflaɪn)
n
a wrinkle near the outer corner of the eye, as if left from smiling or laughing
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References in periodicals archive ?
Imagine a gag-telling comedian (bit of an endangered species in this country since the advent of so-called alternative humour) starting a joke with the laughline and then working backwards.