备胎

Traditional form:

備胎

Pinyin (reading):

bèitāi

Definitions:

• spare tire
• (slang) fallback guy (or girl)

Characters:

• 备 - to prepare; to get ready, to equip; ready; perfect
• 胎 - embryo, fetus; car tire

Traditional characters:

• 備 - to prepare; to get ready, to equip; ready; perfect
• 胎 - embryo, fetus; car tire