The idiom "up to speed" likely originates from the world of transportation and speed measurement. This phrase originally referred to reaching a desired velocity or pace, particularly in the context of vehicles or machinery.. It can now be used in both formal and informal contexts to indicate that someone is well-informed and understands the current state of affairs or has caught up with the necessary knowledge or skills.

Definicja i znaczenie słowa „up to speed” po angielsku

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