匀 can function as an adjective (even, uniform) or a verb (to distribute evenly; to spare some for someone). The verbal usage — 匀给 (to spare/share for) — is common in colloquial speech.
勹 is the wrapping enclosure radical, drawn as a curving arm folding around contents. In 匀 it embraces the two interior strokes, suggesting something parcelled out within a contained space.
Two short parallel strokes sit inside the wrap. They act as twin marks indicating equal portions — the visual core of the meaning even / uniformly distributed. This is graphic ice radical 冫 reused as a divider mark, not actual ice.
