Meanings

hiding in the nest

concealment

to conceal

something used to cover the eyes

hide-and-seek (game)

unregistered rice field

concealed seams

cryptogam

appearance and disappearance

subtle seasoning that brings out the flavor

secretly hoarded goods (esp. those belonging to the Japanese military at the end of WWII)

hidden

appearing and disappearing

comfortable retirement

destruction of evidence

hiding one's embarrassment

early retirement

hidden behind trees

hairdo covering the ears

mysterious disappearance