be upon someone

To be looming or have recently begun
مثال:
Let's meet soon—once the back - to - school rush is upon us, we won't have any free time
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To find or meet someone or something, esp. unexpectedly

To loom or appear to someone suddenly in a threatening way or manner

Ex:
Mr Spock you said you had a theory on why your sensors didnt pick up any ships until they were upon us.
Star Trek TOS

To be imminent or just beginning to have an effect on someone or something

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