悔之已晚

• 之(walk; arrive; step on ground)ASSOCIATIVE

A footstep moving forward on the ground represents "go to," which then becomes a grammatical particle.

• 已(finished; stopped; coiled (representing completion))ASSOCIATIVE

The character resembles a coiled snake curled up on itself, symbolizing something completed or finished.

• 日(sun)RADICAL
• 免(avoid; exempt)PHONETIC

The sun sinking down as if hiding signals that evening has arrived.