one having four big mountain-like shoulders —

 (When incarnating as paraṣurāman), having strength and mountain-like tall shoulders, such that the kings (like kārthaveeryārjunan) die, —

and seven great mountains —

 tall mountains —

the huge mountains [which sustain the earth] —

the huge mountains which sustain earth —

an elephant in exultation, which was like a huge mountain —

like huge mountains —