Let's go meet them right away.
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Be quiet and come over at once!
You'll have to learn this word in two parts. You already know the meaning of 今 because of the kanji, which means "now." The すぐ part, however, is a new word, meaning "soon." The two words even start with the same "soo" sound. If you put these two together, you get "now soon." Put in better English, that's at once or right now.
Since you already know the vocab word 今 (read いま), you should be able to read this word as well.