One way to hold this word: stream plus -er, the thing that keeps pouring out. Fix one end of something and let the rest run on — a strip of paper taped to a wall with its tail pulled straight by the wind, or a picture taped to nothing at all, running out of a camera minute after minute to whoever is watching. Both pictures are the same shape: one end anchored, the rest flowing away from it. That is why one plain word covers a paper ribbon at a birthday party and a person talking to a webcam.
From the word’s history
From Middle English stremer, formed from stream plus the ending -er — literally the thing that streams.
來自中古英文的 stremer，由 stream（流）加上字尾 -er 組成，字面上就是「會流出去的那一個」。這個組合在今天的兩支用法裡都還看得出來。
Wiktionary entry for streamer (kaikki:3f6f69a190036ae4:1029225569): "From Middle English stremer, stremere, equivalent to stream + -er."
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