(informal, figuratively, transitive with à) to do no favours; to not make things easy; to be very strict, to cut someone no slack; to be ruthless, to be merciless

(litotes) to react immediately, to not miss a beat

Alternative form of ne pas en foutre une

to laze around

to be a certainty, to be clear

there's a fine line between... (said of things that are very close to one another, such that one could easily lead to the other)

out of the question! it's out of the question!

to follow in someone's footsteps

you can't judge a book by its cover (it is not possible nor advisable to judge things by external appearances alone)

money doesn't grow on trees