fallback

Từ điển Việt Anh Việt 4in1 - English Vietnamese 4 in 1 Dictionary

fall‧back /ˈfɔːlbæk $ ˈfɒːl-/ BrE AmE noun [countable]
something that can be used or done if a supply, method etc fails SYN backup:
It’s wise to have an extra video player as a fallback.
Do you have a fallback option? ⇨ fall back on somebody/something at ↑fall¹

fallbackhu

◎	['fɔ:lbæk]
※	danh từ
	■	vật dự trữ; sự rút lui