again and again
Constantly or repeatedly. The phone rang again and again until I finally answered it. I've told you again and again to pick your clothes up off the floor, and it's still a mess in here!
again and again
repeatedly; again and even more [times]. He knocked on the door again and again until I finally answered.
again and again
Repeatedly, often, as in I've told you again and again, don't turn up the heat. This idiom uses repetition for the purpose of emphasis (as does its synonym, over and over). Shakespeare used it in Othello (1:3): "I have told thee often, and I retell thee again and again." [c. 1600]
aˌgain and aˈgain
many times; repeatedly: I’ve told him again and again to shut the door but he always leaves it open. again and again
Repeatedly; frequently.