| 活塞 | huó sāi | piston; valve | |
| 塞车 | sāi chē | traffic jam | |
| 塞子 | sāi zi | cork; plug | |
| 软木塞 | ruǎn mù sāi | cork | |
| 瓶塞 | píng sāi | bottle cork; bottle stopper |
| 塞外 | sài wài | beyond the Great Wall | |
| 要塞 | yào sài | stronghold; fort; fortification | |
| 边塞 | biān sài | frontier fortress | |
| 塞翁失马 | sài wēng shī mǎ | lit. the old man lost his horse, but it all turned out for the best (idiom); fig. a blessing in disguise; it's an ill wind that blows nobody any good | |
| 关塞 | guān sài | border fort, esp. defending narrow valley |
| 堵塞 | dǔ sè | to clog up; blockage | |
| 闭塞 | bì sè | to stop up; to close up; hard to get to; out of the way; inaccessible; unenlightened; blocking | |
| 阻塞 | zǔ sè | to block; to clog | |
| 搪塞 | táng sè | to muddle through; to fob sb off; to beat around the bush; to dodge | |
| 语塞 | yǔ sè | to be at a loss for words; speechless |
