Two domains: (1) employment —
保底工资 the floor under your salary regardless of performance; (2) gacha games like
原神 (Genshin Impact) — after N pulls without a top-rarity item, the game guarantees one.
大保底 dàbǎodǐ vs.
小保底 xiǎobǎodǐ are the hard vs. soft pity thresholds.