Forth is one of those words that has gone out of the language except in a number of set phrases. When any work is to be done without any delay or hesitation and with no time intervening , Forthwith is used.

immediately; at once; without delay

Necessarily, if you go forth with others, you go at the same time as they do.

1. The court ordered the company to cease operations forthwith
2. If the fire alarm rings, leave the building forthwith.
3. an official accused of dishonesty should be suspended forthwith

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