seal, closing
封 centers on the act of closing something securely, especially by applying a seal. The core idea is to enclose or shut off, as in sealing a letter or closing a container.
封 combines 圭 (a mound of earth) and 寸 (a hand), originally depicting a hand building an earthen boundary or sealing a mound. The modern meaning of sealing or closing derives from this image of enclosing with earth.
The left side 圭 looks like piled earth, and the right side 寸 is a hand. Imagine a hand pressing a mound of earth to seal a container shut.
For フウ, picture a sealed envelope fluttering in the wind: the sound 'foo' (like wind) cues フウ, and the envelope is sealed.
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seal
opening (a letter, parcel, etc.); breaking the seal
blockade; lockdown; sealing off (an area)
envelope
seal
sealing (away); containment; suppression; charm against; spell against
sealing (something) inside; enclosing (with a letter, etc.)
total blockage; complete shutdown; stopping completely
containment
feudalism
to seal (e.g. a letter)
enclosing (e.g. with a letter)
sealing hermetically; sealing (up)
suppression (e.g. of free speech)
to shut in; to confine (in); to seal in; to trap
sealed letter
premiere; first showing; release (film)
gift of money (contained in an envelope); money reward (for services rendered)
to release (e.g. a film)
padded envelope