盖
gài · HSK 4
cover
🧢 sounds like 'guy' — the guy puts a cap on it to cover and seal
盖 (gài) means cover, lid, or seal. Sound hook: 'gài' rhymes with English 'guy'. Also used figuratively for surpassing — as in covering over or topping something else.
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'.