1
a blocker for [team]
此义指美式橄榄球中负责阻挡对手、为进攻方开路的球员。
He was a blocker for the varsity team.
他是校队的一名阻挡队员。
掩护球员；阻挡队员
先理解核心含义，再看它在真实句子里的用法。
掩护球员；阻挡队员
A football player whose job is to block opposing players to protect the ball carrier.
He was a blocker for the varsity team.
他是校队的一名阻挡队员。
动词block(阻碍或阻止)的施动者名词；阻碍其他事物的事物。
Agent noun of block (“obstruct or prevent”); something that blocks something else.
粗加工钻石的人
A person who roughly shapes a diamond.
为针织品、帽子、书籍(或书皮)、鞋子等定型(拉伸或塑形)或制作这些物品的人。
A person who blocks (stretches or moulds) or more generally makes knitted items, hats, books (or book covers), shoes, etc.
The doctor prescribed a blocker to treat his high blood pressure.
医生开了一种阻滞剂来治疗他的高血压。
These blockers work by stopping the virus from entering healthy cells.
这些阻滞剂通过阻止病毒进入健康细胞来发挥作用。
The patient asked her pharmacist whether the blocker would make her feel sleepy.
这位病人问药剂师，这种阻滞剂是否会让她感到困倦。
此义指美式橄榄球中负责阻挡对手、为进攻方开路的球员。
He was a blocker for the varsity team.
他是校队的一名阻挡队员。
在医学英语中，blocker 常与表示靶点的词构成复合名词，如 beta blocker（β-受体阻滞剂）、calcium channel blocker（钙通道阻滞剂）。
She takes a beta blocker for her heart condition.
她因心脏问题服用β-受体阻滞剂。
Not this
The doctor prescribed blocker for my blood pressure.
Use this
The doctor prescribed a blocker for my blood pressure.
blocker 是可数名词，表示‘阻滞剂/阻断剂’时前面需要加限定词（如 a、the），不能像不可数名词一样裸用。
Not this
He is a good block on the team.
Use this
He is a good blocker on the team.
block 是动词或表示‘阻挡’这一动作的名词；表示‘阻挡队员/掩护球员’这一执行动作的人要用加后缀 -er 的名词 blocker。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
β受体阻滞剂
The doctor prescribed a beta blocker to control his blood pressure.
医生给他开了β受体阻滞剂来控制血压。
钙通道阻滞剂
Calcium channel blockers are often used to treat angina.
钙通道阻滞剂常用于治疗心绞痛。
开路掩护球员
The fullback acted as a lead blocker for the running back.
全卫为跑卫担任开路掩护球员。
跑动掩护球员
He is the best run blocker on the offensive line.
他是进攻线上最好的跑动掩护球员。
传球保护球员
A good pass blocker protects the quarterback.
好的传球保护球员能保护四分卫。
Use blocker naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把block想成‘一块砖’堵路，加-er就是阻挡者；阻滞剂也是一样，把致病信号‘堵’在路上。
语域：formal 常见场景：医学、药学 该义项为医学术语，通常用于指阻断某种生理过程的药物或物质。正式文章和临床交流中比较常见，日常口语中较少单独使用。
locker、rocker、soccer 与 blocker 押韵（都以 /ɔkə/ 结尾）。jogger 拼写相近，但以 /ɡə/ 结尾，不押韵；broker、choker 虽含 -oker，但读作 /əʊkə/，与 /ɔkə/ 不同，也不押韵。
Dictionary facts from ECDICT, WIKTIONARY.