1
the deadbolt on [door]
它是可数名词，通常带冠词或限定词。
The deadbolt on the front door is jammed.
前门上的锁舌卡住了。
锁舌
先理解核心含义，再看它在真实句子里的用法。
锁舌
the part of a lock that is engaged or withdrawn with a key
The deadbolt on the front door is jammed.
前门上的锁舌卡住了。
锁中钥匙转动时移动的部件
The part of the lock which is moved when the key is engaged.
一种锁,其活动锁舌由锁芯固定而非弹簧固定,只能转动锁芯才能缩回
A kind of lock in which the bolt (moving portion) is held in position by the cylinder rather than by a spring and so cannot be retracted except by turning the cylinder.
He turned the key, and the deadbolt slid back into the door.
他转动钥匙，锁舌滑回门内。
Make sure the deadbolt is engaged before you go to sleep.
睡觉前一定要把锁舌锁好。
All the exterior doors have deadbolts for extra security.
所有外门都装有锁舌，以增强安全性。
它是可数名词，通常带冠词或限定词。
The deadbolt on the front door is jammed.
前门上的锁舌卡住了。
也可以说 throw the deadbolt 或 slide the deadbolt，意思相近。
Remember to turn the deadbolt when you leave.
离开时记得转动锁舌。
They secured the back door with a deadbolt.
他们用锁舌把后门锁好了。
Not this
The meeting ended in a deadbolt after two hours.
Use this
The meeting ended in a deadlock after two hours.
deadbolt 指门锁的锁舌，是具体物件；表示谈判、会议等陷入僵局应用 deadlock。两个词形近但意义不同。
Not this
The door is locked by a deadbolt, so it is safe.
Use this
The door is locked with a deadbolt, so it is safe.
被动句中的 by 引出施动者（人或动作执行者），而用工具或手段时应用 with，所以应说 locked with a deadbolt。
Not this
I need to install deadbolt on the front door.
Use this
I need to install a deadbolt on the front door.
deadbolt 是可数名词，单数前需要冠词 a/an；中文没有冠词概念，学习者容易遗漏。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
带锁舌的门锁
The deadbolt lock is more secure than a regular doorknob lock.
带锁舌的门锁比普通的门把手锁更安全。
安装锁舌/插芯门锁
We installed a deadbolt on the front door after the break-in.
入室盗窃后我们在前门安装了锁舌。
锁上插销
Every night she throws the deadbolt before going to bed.
她每晚睡觉前都锁上插销。
锁舌扣板
A reinforced deadbolt strike plate prevents the door from being kicked in.
加固的锁舌扣板可以防止门被踢开。
锁舌钥匙
I can't find the deadbolt key for the back door.
我找不到后门的锁舌钥匙了。
打开插销
He disengaged the deadbolt and let the dog out.
他打开插销，放狗出去了。
Use deadbolt naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想记忆：dead（死/静止）+ bolt（门闩），想象锁舌像死了一样卡住不动，必须用钥匙才能拨动它，这就是门锁的锁舌。
语域：neutral 常见场景：home security、locksmithing、door hardware deadbolt 表示门锁的锁舌（尤指用钥匙转动的部分），通常是中性词，多用于家居安防、门锁安装或五金相关语境；正式和日常非正式场合都可以使用。
The first syllable of deadbolt /ˈdɛd.boʊlt/ rhymes with dead, head, and said (/dɛd/, /hɛd/, /sɛd/). The final syllable matches bolt, colt, and dolt (/boʊlt/, /koʊlt/, /doʊlt/), but because stress falls on the first syllable, those are not whole-word rhymes. Beware lookalikes: bold /boʊld/ ends with /d/ instead of /t/, and deed /diːd/ has a different vowel.
Dictionary facts from ECDICT, WIKTIONARY.