腰

lower back; waist; hips; lumbar region

Usu. コシ

body (of hair, noodle, paper, etc.); resilience; spring

posture; position; pose; attitude

Counter

counter for swords, hakama, obi, etc. worn around the waist

こし only; Counter

counter for quivers of arrows

to sit down

to sit (down)

to half-rise to one's feet

to get up (from sitting); to stand up

Idiomatic expression

to (finally) start to do something; to get off one's backside; to take action

to dislocate one's back

to be unable to stand up due to fear or surprise

to be unable to stand; to be weak in the knees; to be paralyzed (e.g. with fear) (paralysed); to be dumbfounded

to sit down; to take a seat

coward

to get cold feet; to back away; to withdraw

to interrupt (a story, etc.)

to bend at the waist

to settle down

to settle down (and deal with something); to concentrate all one's energy (on something)

to settle oneself (in a place); to settle down (somewhere); to settle in

to take a solid stance; to lower one's center of gravity (centre)

to bend forward; to stoop; to bow

seat; bench

Colloquial

temporary job while looking for a better job or until one marries

chamber maid; female servant

area around the hips; waist area

lower back pain; lumbago

measurement round the hips

hanger-on; follower; flunky; sycophant

purse strapped round one's waist

hipbone; innominate bone

fortitude; perseverance; endurance; persistence

to collapse; to give up; to lose one's nerve; to have one's knees give way

Sumo

collapsing in the middle of a bout

breaking down (while in the middle of something); faltering halfway