Where does “թեւճակ” come from?

թեւճակ (Armenian) comes from Old Armenian թեւճակ, from Old Armenian թեւ, from Proto-Indo-European ptewo-, from Proto-Indo-European peth₂- — to spread out; to fly.

թեւճակ (Armenian): oar; tennis racket; fastening bar

Definitions

oar; tennis racket; fastening bar

Ancestry of “թեւճակ”, step by step

Step	Language	Word	Meaning
1	Old Armenian	թեւճակ	oar
2	Old Armenian	թեւ	wing; arm of a human; flight, rush, dash
3	Proto-Indo-European	ptewo-	—
4	Proto-Indo-European	peth₂-	to spread out; to fly

Every word from Proto-Indo-European peth₂- →Every word from Proto-Indo-European ptewo- →Every word from Old Armenian թեւ →