to behave in a way that shows one has no self-respect

abase, demean oneself

a bone at a finger-joint; (in animals) a knee-joint

comply, endure

to put (oneself) under the control of another; to put (an idea etc) forward for an opinion, decision etc; to suggest (something)

comply, endure

to give in (to a ruler, death, temptation, flattery etc)

die or surrender