大致
dàzhì · HSK 5
roughly
大 (big) + 致 (extent) = big extent, i.e. roughly/approximately
大致 literally combines 'big/broad' with 'reach/extent', giving the sense of 'in broad terms'. Compare 大约 (dàyuē, about) — both use 大 to signal a wide, non-precise scope.
大 — pictograph of a person with arms outstretched
大 is a pictograph showing a person standing with arms and legs spread wide. The outstretched arms suggest 'big' or 'great', extending from the literal image of a large stance to abstract meanings like important or grand. It is one of the oldest characters, found on oracle bones.
致 — arrive 至 + strike/go 攵
Originally a compound of 至 (to arrive, showing an arrow reaching the ground) and 攵 (a hand with a stick, indicating action). Together they suggested 'to cause to arrive' or 'to send/deliver,' which broadened into modern senses like 'to send, devote, or bring about.'