Regret, the French way (3)
I believe the answer is:
rue
I believe this is a double definition.
'regret' is the first definition.
(I've seen this before)
'the french way' is the second definition.
(I've seen this before)
(Other definitions for rue that I've seen before include "At one time, pity" , "Be regretful" , "Regret the bitter herb" , "Regret, be sorry for" , "Bemoan" .)