Idiom: Next Thing One KnowsCheck definitions of...nextthingoneknowsMeaningsHow to pronounce "next thing one knows":AU Your browser does not support the audio element. suddenly, out of the blue.A-Z Proximitiesnew dawnnew kid on the blocknew normalnew wine in an old bottlenew wine in an old wineskin next thing one knows next-levelnice guynice guys finish lastnickelnickel and dimeSimilar Idiomsnext thing one knowsas far as one knowsthe nose knowsyou knows itas the next girlas the next guya week from next Tuesdaynext-levelsee you next Tuesdaydo one's own thinglast thing one needsany old thingbest thing since sliced breadbest thing since sliced panbright young thingchance'd be a fine thingdo the decent thinggreatest thing since sliced breadhave another thing cominglast thingSimilar Phrasesgod knows hownext doornext friendnext of kinnext-to-lastanimate thingthing-in-itselfliving thingnear thingreal thingsure thing