Answer: wah

AnswerCrossword Clue
WAHWhen repeated, a trombone sound
WAHWhen doubled, a sad sound effect
WAHCry from a nursery
WAHCartoon baby's cry
WAHPlaintive cry
WAHCrib note?
WAHCartoonish baby cry
WAHWhen doubled, a musical effect
WAHNursery output
WAHWhen repeated, kind of pedal
WAHWhen doubled, a guitar or horn effect
WAH"Do ... Diddy Diddy" (1964 hit)
WAHBaby's wail
WAHHalf a trumpet's sound
WAH"... Hoo," 1936 song
WAHPanda
WAHTibetan name for the panda.
WAHNursery sound
WAHWhen doubled, an electric guitar sound
WAHMuted trumpet sound
WAHOutburst in a nursery
WAHTrumpet sound
WAHCrybaby's word
WAHBawling sound
WAHBaby cry
WAHTrumpet's sound
WAHWhen repeated, a guitar effect
WAHBaby bellow
WAHGuitar effect, when doubled
WAH"Do ... Diddy Diddy": Manfred Mann
WAHWhiner's comment
WAHToddler cry
WAHInfant cry
WAHInfant's outburst
WAHSound heard a lot by new parents
WAH... pedal (guitar accessory)
WAHCrib cry
WAHInfantile outburst
WAHWhen doubled, a guitar effect
WAHManfred Mann's "Do ... Diddy Diddy"