Possible response to "Don't know" (5)
I believe the answer is:
guess
(Other definitions for guess that I've seen before include "Estimate; suppose" , "Conjecture - estimate" , "Estimate roughly" , "Hypothesis" , "Dare say" .)
I believe the answer is:
guess
(Other definitions for guess that I've seen before include "Estimate; suppose" , "Conjecture - estimate" , "Estimate roughly" , "Hypothesis" , "Dare say" .)