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um and ah

To be hesitant or indecisive, especially when speaking out loud about a decision. "Um" and "ah" are common filler words used by habit or when one is deciding what to say. Try not to um and ah so much when you're considering a counter-proposal—it's not professional. It felt like that guy ummed and ahed for five minutes before he gave me his order.
See also: ah, and, um
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

ˌum and ˈaah (about something)

(also ˌhum/ˌhem and ˈhaw less frequent) (informal) speak but say nothing important because you need more time to think about a problem, matter, etc: He ummed and aahed for about half an hour and then finally said he would lend me the money.After a lot of umming and aahing, he finally said yes to the plan.
Um, aah, etc. are sounds that people make when they hesitate or do not know what to say next.
See also: aah, and, um
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
THERE were plenty of oohs and aahs when the Mechu speciality shellfish platter was brought to our table.
The Curried Mussels with Oven Frites [shown at right] brought oohs and aahs to our Sunday table.
The primary local shelter for the homeless in Athens, Georgia, is the Athens Area Homeless Shelter (AAHS).
From traditional to novelty, these fantasies will draw oohs and aahs from admirers all season long.
With Four Seasons' experienced team of glazing professionals, making buildings get the "oohs" and "aahs" that translate into "sold out" is now as easy as specifying a window or a door.
That kinda experience could lead you to hittin' Pookie's Pet Supplies, Fred's Fill Dirt & Croissants, or, in this case, "Aahs," an upscale kiddie shop in L.A.-area Sherman Oaks, Calif.
They give "oohs" and "aahs" of approvals as they fly along Malaysia's first underground commuter line.
Companies mentioned include Zomax (ZOMX), Shuffle Master (SHFL), Digital Biometrics (DBII), Grand Casinos (GND), Rainforest CafT (RAIN), Wilsons Leather (WLSN), Chronimed (CHMD), FSI International (FSII), Children's Broadcasting (AAHS), Disney (DIS), Harmony Holdings (HAHO), Medtronics (MDT), St.
Divot the Golfing Clown was there, along with Cowboy Bob and Rockin' Rob of Radio AAHS, who did a live broadcast from the Fitness Farm.
It's not that he's such a loud talker--Nifty Nicholas is a deejay for Radio AAHS, and his voice is carried through the airwaves to thousands of young listeners.
Records Black Music Division (www.wbr.com/black), Elektra Entertainment Group (www.elektra.com), WarnerActive CD-ROM games division (www.warneractive.com) and Radio Aahs (www.pathfinder.
A recreation of 18th-century fireworks brings "oohs" and "aahs" from the crowd.