がく
picture frame
A frame is a guest's face hung up on the wall, and the photograph went into one. Everybody who comes in stops to gawk がく at it: がく.
Read ひたい the same character is your forehead, which is the 額 in 額に汗. がく is the frame, and also a sum of money.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.