galxe gismu

x1 is a/the throat/gullet [body-part] of x2; [metaphor: narrow(ing) opening of a deep hole].

See also cnebo, kevna, tunlo.

In notes:

cnebo
x1 is a/the neck [body-part] of x2; [metaphor: a relatively narrow point].
kevna
x1 is a cavity/hole/hollow/cavern in x2; x1 is concave within x2; x2 is hollow at locus x1.
tunlo
x1 gulps/swallows.
galxyfe'a
f1=g1 is a/the pharynx [body-part] of g2.
galxypunli
g1=p1 is the Adam's apple (laryngeal prominence) of g2=p2.
selctebi
x1 is an orifice, with lip x2, of body x3.