tall, high, expensive
高 centers on vertical extent or degree: something tall, high in position or level, and by extension expensive (high in price).
高 is a pictograph of a tall watchtower or raised structure, with the modern form preserving a roof-like top and a base. The idea of height extends naturally to high cost.
Picture a tall watchtower: the top 亠 is the roof, the middle 口 is a window, and the bottom 冂 with another 口 inside is the enclosed base. The whole structure stands high above the ground.
For コウ, imagine a tall tower so high it touches the clouds, and a person named Kou standing on top shouting 'Kou!' to be heard from such a height.
high; tall
quantity; amount; volume; number; amount of money
best; supreme; wonderful; finest
senior high school; high school
high-speed; rapid; express
senior high school student
high-class; high-grade; high-quality; high-end; luxury
advanced age; old age
altitude; height; elevation
girls' high school
to rise; to swell; to be promoted
high class; high grade
large sum (of money); large amount
highly priced; expensive; valuable; costly
to raise; to lift; to boost; to enhance
elevation; height above sea level
high efficiency; high performance
high mountain; alpine mountain
high price
rise; swell; elevation; upsurge
high-rise (building); multistory; multistoried; tall
Supreme Court
high temperature
sharp rise (in prices); steep rise; substantial increase; soaring
highest peak; highest mountain
tableland; plateau
high voltage; high pressure
(bank) balance; remainder
high official
elevation (of spirits); raising (of morale); uplift; upsurge
comparatively high; fairly expensive
middle and high school
having graduated from high school (as one's highest completed level of education); high school graduate
high place; high ground; height; (high) altitude; elevation
High Court
high ground; elevation; hill; plateau
elevated (structure); overhead
high fever
high and low; rise and fall
famous; noted; renowned; celebrated; well-known
high-pitched tone; soprano
lofty; sublime; noble
high ground; plateau; heights; highlands
high blood pressure; hypertension
shallow river; shallows
upper grades of primary school (sixth, fifth, and sometimes fourth grades)
high (atmospheric) pressure; high-pressure system; high-pressure zone; anticyclone
yield; crop; production; volume; piecework
loud; sonorous; ringing
high salary
your views; your opinion
high waves; heavy seas
loud (of a voice)
famous; well-known; renowned; distinguished; celebrated
high; noble; refined; advanced
high level
dignity; eminent; high ranking
high-pitched; shrill
high mountain; lofty peak
high priest; highly ranked priest
high speed
high rate
blast furnace
appreciation of the yen; strong yen
very likely; very probable
sales; amount sold; proceeds
female high school student
Public Prosecutor's Office
highest grade; top class
tall (of a person)
(running) high jump
height; altitude; elevation; level
high income
high quality
noble; lofty; high-minded; virtuous; upright
senior high school; high school
higher education; tertiary education
high-class hotel; luxury hotel
express intercity bus
highway; freeway; expressway; motorway
Goryeo (dynasty of Korea; 918-1392 CE); Koryŏ
old person; elderly person; senior citizen