tongue, reed, clapper
舌 centers on the physical tongue and tongue-shaped objects: the organ itself, a reed (like a tongue of a musical instrument), or a clapper (the striking tongue inside a bell).
舌 is a pictograph of a tongue sticking out of a mouth 口, with the top stroke representing the forked tip or the tongue itself.
The top stroke is the tongue sticking out, and the box below is the open mouth 口. Together they form 舌, a tongue.
For ゼツ, imagine a lizard's tongue zapping out to catch a fly: zets -> ゼツ, the quick tongue motion.
tongue
wicked tongue; sharp tongue; abusive language
clicking one's tongue; tut-tut
talkativeness; garrulity; loquacity
shrike (any bird of family Laniidae)
tip of tongue
double-dealing; duplicity; equivocation; double-tongued
speech; eloquence; manner of speaking; manner of expression
unclear speech; garbled speech; poor enunciation
dislike of very hot food or drink; inability to take hot food; cat tongue
feel on the tongue (of food or drink); texture
smacking one's lips (over food)
written and spoken words; description
agave; maguey
sharp tongue; eloquence
licking one's lips (at the sight of appetizing food)
war of words
retroflex; retroflex consonant; retroflex sound
eloquent tongue
double-dealing