1.
secret trick; hidden technique; hack
A clever trick, shortcut, or hidden technique not widely known. Originally used for hidden commands in video games, now broadly applied to any insider tip or life hack.
A compound of 裏 (hidden side, behind the scenes) and 技 (technique, skill).
Common collocations
Originally popularized in the context of video games (cheat codes, hidden features, Easter eggs), the word has expanded to mean any clever insider tip. It is very common in lifestyle media, cooking shows, and online content, where it is essentially equivalent to the English "life hack." The tone is informal and positive — a 裏技 is a welcome shortcut, not something underhanded.