To cause (rays of light, etc) to converge at a single point.
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Example
The difficulties of focussing colour-light signals on curved tracks to ensure maximum sighting distance were underlined in the recent official report [...] on a low-speed collision at Newcastle Central on July 25, 1960, between an unfitted freight and a diesel-hauled passenger train.
Order number
4
Part of speech
verb
No relations.
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