bend down, bow, lie prostrate
臥 centers on lowering the body into a horizontal or submissive position: bending down, bowing, or lying prostrate.
臥 combines 臣 (a pictograph of a bent or lowered person) with 人 (person), reinforcing the idea of a person bending down or lying prostrate.
The left side 臣 looks like a person bending over, and the right side 人 is another person. Together they show someone bowing or lying down.
For ガ, imagine a person bowing so low they look like a gargoyle crouching on a ledge: gargoyle -> ガ, and the bent posture matches 臥.
to lie down (and sleep); to go to bed (with an illness)
sitting and lying down
going through thick and thin to attain one's objective; enduring unspeakable hardships for the sake of vengeance
lying on one's back; lying face upward; lying supine
lying face down; lying on one's face; lying prostrate
lying face down
lying down on one's side
lying-in bed
quiet rest
quitting one's job as a government official to return to live quietly in one's own native region
at all times; day in, day out; constantly; always
lying down
lying on one's side
sleeping together
being ill in bed
to fall and roll over; wriggle about
to lie down (in bed); to take to one's bed
to lie down (in bed); to retire (to bed); to become bedridden (with an illness)
to lie down (in bed); to take to one's bed
to lie down