Bear, tolerate (6)
I believe the answer is:
endure
I believe this is a double definition.
'bear' is the first definition.
(both can mean to tolerate)
'tolerate' is the second definition.
(I know that tolerate is a more specific form of endure)
(Other definitions for endure that I've seen before include "'Last, bear (6)'" , "Bear something patiently" , "Undergo hardship patiently" , "Tolerate, put up with" , "Put up with or withstand" .)