1. Expression of hesitation
   - er, uh

Encyclopedia: Um

• dideoxycytosine
• dideoxyinosine
• Diderot
• didgeridoo
• Didion
• didn't
• dido
• Didrikson
• didst
• didymium
• die
• die away
• die down
• die off
• die out
• die-cast
• dieback
• Dieffenbachia
• Dieffenbachia sequine
• diegesis
• Diego Rivera
• Diego Rodriguez de Silva y Velazquez
• Diegueno
• diehard
• dielectric