expression, ichidan verb
get cold feet; back away; withdraw
Describes losing nerve or becoming hesitant, often in a situation requiring courage or commitment. Literally 'one's hips pull back', evoking a physical retreat from a challenge.
いざ本番になると腰が引けてしまった。
When it came time for the actual performance, I got cold feet.
He seems to be backing away from taking responsibility.