noun / verb
gong
GAWNG/ɡɔːŋ/
A metal disk struck to make a resonant sound, or to use it.
The bronze gong hangs beside a padded mallet.

Etymology
Malay gong is probably an imitation of the sound made when the instrument is struck, naming the metal disk through its characteristic sound.
In context
next is our survival. The only hope. Everyone prepare. From now on, Su family village will have patrols day and night. If there is anything a miss, immediately sound the gong and take your positions.