What does 熄灯 (xī) mean in English?

Card 48NPCR Level 3848/58
CARD48
PROGRESS83%
熄灯
熄燈
xī (dēng)
put out (a lamp)(Verb)

Reveal: Click/Space/Enter/↑↓/w/s/j/kNavigate: ←→/h/l/a/d