To capsize, tip over, or subvert; to fall or be defeated; to overturn; to upset.

a nest, hive, or lair for birds, insects, or other animals; also a home or dwelling

(bound form) under; below; beneath; less than; not more than

to not have; there is no; lack; (as prefix) non-; un-; -less

an unbroken egg; (metaphorical) person or thing that remains intact or unscathed, usually in the context of the idiom 覆巢之下，无完卵 fù​cháo​zhī​xià​wú​wán​luǎn