Synonym: all of a sudden, all together. Similar words: at once, at one time, installation, once, conciliatory, regulator, concert, concept. Meaning: adv. 1. all at the same time 2. without warning.
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1. No man ever became thoroughly bad all at once. 
2. He altered his face all at once.
3. She wanted to laugh and weep all at once.
4. All at once he fell into a state of profound melancholy.
5. All at once I tumbled to what he meant.
6. The archers drew their bows all at once.
7. All at once an idea popped into her head.
8. All at once there was a loud crashing sound.
9. Don't go crazy and spend it all at once.
10. I'm loath to spend it all at once.
11. The archers drew all at once.
12. All at once the door opened.
13. I felt afraid all at once.
14. All at once she lost her temper.
15. You can't do everything all at once.
16. All at once there was someone knocking on the door.
17. It's a lot of information to absorb all at once.
18. Making big changes in your diet all at once is a bad thing to do .
19. He drank off a whole litre of beer all at once.
20. She paid me in dribs and drabs(sentencedict.com), not all at once.
21. All at once there was a loud banging on the door.
22. All at once, Mick's serious expression softened into a grin.
23. Father Timothy was kind and bad all at once.
24. All at once,[sentencedict.com] she broke into a smile.
25. You can have it all. You just can't have it all at once.
26. How is it possible to feel love for two men all at once?
27. A lot of practical details needed to be attended to all at once.
28. He couldn't reasonably be expected to pay back the loan all at once.
29. So many thoughts of Haas were now crowded into her mind all at once.
30. He has a habit of planking out the whole cost all at once.
More similar words: at once, at one time, installation, once, conciliatory, regulator, concert, concept, concede, concern, regulatory, legislator, surveillance, conceive, once more, concerning, conception, concentrate, once in a while, once upon a time, concentration, concentrating, collar, all along, collapse, all around, as well as, tone, get on, button.