相当
xiāngdāng · HSK 3
quite
⚖️ 相 (mutual) + 当 (match) — mutually matching, i.e. equivalent to a fair degree
相 means mutual/reciprocal; 当 means to match or be equal to. Together 相当 literally reads as mutually matching, which extends to meaning quite, fairly, or considerably — describing something that matches a notable degree.
当 — small ⺌ + crown 冖 + hand 彐 (simplified from 當: 尚 + 田)
Originally written 當, combining 田 'field' with 尚 as a phonetic. The early sense was 'to match' or 'face' a field of equal value, extended to 'correspond to', 'ought to', and 'serve as'. The simplified form 当 streamlines the upper 尚 component.