The compound **全心全意** is formed through a parallel and repetitive four-character structure common in Chinese idioms, where the first and third characters are identical (全, *quán*, meaning "whole" or "entire"), and the second and fourth characters are closely related semantic elements (心, *xīn*, "heart" and 意, *yì*, "mind" or "intention"). This A₁B₁A₁B₂ pattern creates a strong rhythmic and emphatic effect, with the two parallel phrases "whole heart" and "whole mind" combining not merely additively but intensively to express the concept of total, undivided dedication and sincerity. The formation thus relies on synonym compounding and structural repetition to amplify meaning, resulting in a vivid expression meaning "with all one's heart and mind" or "wholeheartedly."