a crab, that burrows in the ground.

the act or an instance of exchanging blows with fists mutually.

a physical struggle; a fight.

(fig.) great effort or a series of efforts (in achieving something against odds and hIndrances).

to fight with another person, striking or punching mutually with the fists; to exchange blows.

(fig.) to make great efforts or attempts (against odds or stiff opposition).