su verb - precursor to the modern suruintransitive verb archaic only applies to くっす to yield;to give in;to be daunted;to shrink

su verb - precursor to the modern surutransitive verb archaic only applies to くっす to bend (knee, etc.)

su verb - precursor to the modern surutransitive verb archaic only applies to くっす to subdue;to overpower

su verb - precursor to the modern suruintransitive verb archaic to feel down