固gù
to solidify; strength. 8 strokes, radical 囗, first met in HSK 4.
How to write 固
Free, with no account: the app draws each stroke, then you write it and it says which stroke went wrong.
Print a 米字格 practice sheet for 固 · the stroke-order rules
What 固 is made of
囗 (wéi, enclosure) and 古 (gǔ, old).
囗 carries the meaning — border — and 古 carries the sound.
Words that use 固
| 固定 | anchored steadfast (fixed) 牢牢地装好，不会移动或摇晃 货架牢牢固定以防地震。The shelves are anchored firmly to guard against earthquakes. Lesson 283, 物资供给与市场流通 · 现代工造与城市商埠 · Modern Engineering, Commerce & Urban Structure |
| 坚固 | sturdy 结构结实，不容易坏或倒塌 这座服务区的建筑十分坚固。This service station's building is very sturdy. Lesson 297, 驰骋四海与笃定前行 · 岁时纪事与笃行日新 · Seasonal Chronicles, Diligent Work & Physical Vitality |
| 巩固 | to consolidate, strengthen 指使更加稳固牢靠 边防官兵英勇击退境外武装攻击，巩固国家边防。This strengthened the nation's border defenses. Lesson 584, 固本拓疆 · 艺苑流芳与经世济民 · Civic Governance & Cultural Renaissance |
Characters that share the sound part 古
Written with the same phonetic, so their readings tend to rhyme with each other.
More characters with the radical 囗
All 12 of them, and what the radical means, on the 囗 radical page.