严实 | yán shi | (sealed) tight / close / (hidden) safely / securely | |
紧闭 | jǐn bì | to close securely / tightly closed / secure | |
钉死 | dìng sǐ | to nail securely / to execute by means of impalement / to crucify | |
关紧 | guān jǐn | to close firmly / to fasten securely / to make fast / to lock |