Crossword Genius

Speak freely about what the dentist said? (4,2)

Ross

I believe the answer is:

open up

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'speak freely' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for open up that I've seen before include "Talk more freely" , "Unlock building or reveal inner thoughts" , "reveal emotions?" , "Begin firing; disclose" , "Begin shooting; become more confiding" .)

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