施加
shī jiā · HSK 7
to exert (effort or pressure)
💪 施加 = apply + add; you apply-and-add force onto something to exert pressure
加 — force 力 + mouth 口
加 is traditionally analyzed as a compound of 力 (strength) and 口 (mouth), suggesting boasting or exaggerating one's effort with words. From this it extended to the meaning 'to add' or 'increase'. Today it is used broadly for addition, both literal and figurative.