(figuratively) to think twice

(figuratively, informal) to split the difference, to meet halfway

(vulgar, figuratively) to fall between two stools, to have a foot in both camps, to be piggy in the middle, to be caught in the middle, to be sitting on the fence

forewarned is forearmed

(figuratively) to pluck up one's courage, to gather up one's courage, to man up

Alternative spelling of en deux coups de cuillère à pot

to burn the candle at both ends (to do things in excess, to engage in too much work or too much pleasure (including spending money), or both)

(informal) in two shakes, in a flash, in a jiffy

one must choose the lesser of two evils

Alternative form of entre deux maux, il faut choisir le moindre: one must choose the lesser of two evils