degenerate vs run out of steam

degenerate

• To cause to lose good or desirable qualities. 

• To lose good or desirable qualities. 

• Having lost good or desirable qualities. 

• Having deteriorated, degraded or fallen from normal, coherent, balanced and desirable to undesirable and typically abnormal; an immoral or corrupt person. 

• Having the same quantum energy level. 

• Having multiple domain elements correspond to one element of the range. 

• Having multiple different (linearly independent) eigenvectors. 

• One who is degenerate, who has fallen from previous stature. 

run out of steam

• To run out of energy or motivation.