掩盖
yǎn gài · HSK 7
to conceal
🙈 掩 cover-with-hand + 盖 lid = cover up; two covers stacked to conceal
Both characters mean cover: 掩 has the hand radical 扌for covering by hand, and 盖 means a lid or cover. Doubling the covering sense gives the strong idea of concealing or covering something up.
盖 — grass 艹 + 盍 (cover/lid)
Originally written 葢, this character combines the grass radical 艹 with 盍 ('to cover'), which itself shows a lid over a vessel. It first referred to a thatched grass cover or lid, then broadened to mean 'to cover' generally, and later extended to surnames and the conjunction 'thereupon'.