at once

Từ điển Anh Việt - English Vietnamese Dictionary

at+once

	thành ngữ at
		at once
			(xem) once
	[at once]
	saying && slang
		at the same time, simultaneously
			You can't do two things at once. You can eat or talk, but not both.
		now, immediately
			Your mother said you should come in at once - immediately.