I want to understand more - The Maha Mrityunjaya Mantra

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Om trayambakam yajaamahe sugandhim pushtivardhanam Urvaarukamiva bandhanaan mrityor muksheeya maamritaat. Meaning: We worship the three-eyed One Who is fragrant and Who nourishes well all beings; may He liberate us from death for the sake of immortality even as the cucumber is severed from its bondage Please tell me the symbolism behind this