HSK 6 · verb · noun
塞
to stuff; to squeeze in; to cram; to stop up; to block (塞)
他把信塞进了信封。
Tā bǎ xìn sāi jìnle xìnfēng.
He stuffed the letter into the envelope.
路上车太多，交通堵塞了。
Lùshang chē tài duō， jiāotōng dǔsèle。
There are too many cars on the road, so traffic is blocked.