tamji -taj- gismu

x1 is a/the thumb/big toe [body-part] on limb x2 of x3; [metaphor based on relative shape].

Thumb (specifically the hand = xantamji), big toe (= jmatamji). See also degji, tance, xance, jamfu.

In definition:

tance
x1 is a/the tongue [body-part] of x2; (metaphor: similar to nazbi, tamji, degji).

In notes:

degji
x1 is a/the finger/digit/toe [body-part] on limb/body site x2 of body x3; [metaphor: peninsula].
jamfu
x1 is a/the foot [body-part] of x2; [metaphor: lowest portion] (adjective:) x1 is pedal.
xance
x1 is a/the hand [body-part] of x2; [metaphor: manipulating tool, waldo].
tajgai
g1 is a thimble.
xantamji
t1 is the thumb on hand t2=xa1 of t3=xa2.