(right) on cue

as if planned to happen exactly at that moment.

We were traveling up a narrow river in East Africa when, right on cue, a hippopotamus thrust its head out of the water.

• duck out of
• duck out of somewhere
• due to
• due to something
• duke it out
• dust off
• dust settles
• dust something off
• dust yourself off
• Dutch courage
• Dutch treat
• duty bound to
• duty bound to do something
• dyed-in-the-wool
• each own
• each their own
• each to her own
• each to hisown
• each to own
• eagle-eyed
• early bird catches the worm.
• early on
• earn brownie points
• earn spurs
• earn stripes