People whose job is to watch and identify something specific, like people who watch for incoming aircraft or help watch a weightlifter during heavy lifts.
From 'spot' (possibly from Old Norse 'spottr' or onomatopoeia for a small mark) plus '-er' (one who does). The modern sense of 'to notice or identify' developed from the literal meaning of seeing a spot or mark.
Aircraft spotters during World War II were ordinary citizens who became the first line of defense—thousands of volunteers watching the skies identified enemy planes so fast that they saved countless lives, proving that careful observation beats technology sometimes!
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