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Japanese word 送球 comes from Japanese 球, Japanese 送.

送球 etymology ?

送球 detailed word origin explanation

Dictionary entryLanguageDefinition
Japanese (jpn) (slang, electronics) vacuum tube, valve. Ball. Bulb (as in a light bulb) (baseball) pitch. (slang, electronics) vacuum tube, valve. Sphere; globe; orb.
Japanese (jpn)
送球 Japanese (jpn) Handball.