情急之下

• 忄(heart; emotion)RADICAL
• 青(blue-green; pure; clear)PHONO-SEMANTIC

Pure emotion like clear blue sky comes from the heart.

• 刍(mow; gather)PHONETIC
• 心(heart; mind)RADICAL

A heart squeezed tight like a bundle of grass expresses the feeling of urgency and anxiety.

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

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

• 一(horizontal line; boundary)RADICAL
• 卜(stroke descending downward)ASSOCIATIVE

A vertical stroke pointing downward across a boundary line marks 'below'.