(figuratively) to give up; to stop trying

to draw the curtains (closed) / to close down, to close up shop (end)

lowering

plural of baissement

to lower one's guard

(informal) to lower one's voice, to keep it down

(theater) final curtain (the last time the curtain is lowered, after a performance and any curtain calls) / (figuratively) final curtain (the end to something that has lasted for a long time)

Alternative form of baisser la garde