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a tumbler of [liquid]
tumbler 指平底无柄的玻璃杯；a tumbler of ... 表示“一杯 ... 的量”。
She drank a tumbler of cold water.
她喝了一平底杯冷水。
平底玻璃杯；无柄平底杯
先理解核心含义，再看它在真实句子里的用法。
平底玻璃杯；无柄平底杯
a flat-bottomed drinking glass with no handle or stem
She drank a tumbler of cold water.
她喝了一平底杯冷水。
锁中的可移动障碍物,需通过钥匙等调整至特定位置才能开锁或上锁。
A movable obstruction in a lock, consisting of a lever, latch, wheel, slide, or the like, which must be adjusted to a particular position by a key or other means before the bolt can be thrown in locking or unlocking.
用于抛光小零件的旋转设备。
A rotating device for smoothing and polishing rough objects, placed inside it, on relatively small parts.
枪机锤上的零件,主弹簧作用其上,内有缺口供扳机进入。
A piece attached to, or forming part of, the hammer of a gunlock, upon which the mainspring acts and in which are the notches for sear point to enter.
无柄、无脚、无把手的平底玻璃杯,最初因底部凸起而必须一口喝完。
A drinking glass that has no stem, foot, or handle — so called because such glasses originally had a pointed or convex base and could not be set down without spilling. This compelled the drinker to finish their measure.
He poured the orange juice into a tall tumbler.
他把橙汁倒进一个高平底玻璃杯里。
She filled the tumbler with water and set it on the table.
她往平底玻璃杯里倒满水，然后放在桌上。
I need a clean tumbler for my iced tea.
我需要一个干净的平底玻璃杯来喝冰茶。
tumbler 指平底无柄的玻璃杯；a tumbler of ... 表示“一杯 ... 的量”。
She drank a tumbler of cold water.
她喝了一平底杯冷水。
指杂技演员时，tumbler 常与 perform、do 等动词搭配。
The tumbler performed a perfect somersault.
这名杂技演员完成了一个完美的翻筋斗。
在锁具中，tumbler 指需与钥匙齿形对齐的制栓或弹子。
A tumbler in a lock must align with the key before the bolt moves.
锁里的制栓必须与钥匙对齐，锁闩才能移动。
Not this
Please give me a tumbler water.
Use this
Please give me a tumbler of water.
当用容器名词表示“一……的容量”时，英语必须在容器后加介词 of 再接所装的东西，如 a tumbler of water。不能说 a tumbler water，这是受汉语“一杯水”量词结构的影响。
Not this
The performer tumblers across the stage.
Use this
The performer tumbles across the stage.
tumbler 是名词，意为“杂技演员”或“平底杯”；表示“翻跟头、做杂技动作”时要用动词 tumble。主语是单数第三人称，所以谓语用 tumbles。这是把名词误当动词用的词性混淆错误。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
一杯水
He poured himself a tumbler of water before taking the medicine.
他给自己倒了一杯水，然后吃药。
水晶平底杯
She poured juice into a crystal tumbler.
她把果汁倒进一个水晶平底杯。
马戏团翻斤斗演员
The circus tumbler amazed the audience with backflips.
这位马戏团翻斤斗演员以后空翻令观众惊叹。
弹子锁
The door is fitted with a tumbler lock.
门上装了弹子锁。
Use tumbler naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 tumble（翻滚）：tumbler 既是翻跟头的杂技演员，也是不易翻滚的平底杯，锁里需翻动的弹子也同名。
语域：neutral 常见场景：家庭日常饮水、餐厅/酒吧点饮品、招待客人 tumbler 作“平底无柄杯”解时属于中性词，多用于日常口语和一般书面语，在餐厅、酒吧或家庭场合都比较常见；没有明显的正式或俚俗色彩。
表示“一杯的容量”时，常用 a tumbler of + 名词的结构。
Dictionary facts from ECDICT, WIKTIONARY.