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troll for sth
troll for 表示“以曳绳拖钓”；此时 troll 为不及物动词，后接介词 for 再接目标鱼种。
The fishermen trolled for salmon all morning.
渔夫们整个上午都在用拖钓法钓鲑鱼。
（北欧传说中的）巨怪；山怪
先理解核心含义，再看它在真实句子里的用法。
（北欧传说中的）巨怪；山怪
a supernatural creature in Scandinavian folklore, often a dwarf or giant, said to live in caves or mountains
The fishermen trolled for salmon all morning.
渔夫们整个上午都在用拖钓法钓鲑鱼。
一种从雷暴电活跃核心区顶部喷出的光学现象,呈红色,似乎发生在强烈的精灵状放电触须向下延伸至云顶之后。
An optical ejection from the top of the electrically active core region of a thunderstorm that is red in colour and seems to occur after tendrils of vigorous sprites extend downward towards cloudtops.
旋转的动作；重复,例行公事。
An act of moving round; a repetition, a routine.
使用流动的钓线钓鱼,或在船后拖带装有鱼饵或诱饵的线钓鱼的行为。
An act of fishing by using a running fishing line, or by trailing a line with bait or lures behind a boat.
用于这些方式钓鱼的钓线、鱼饵或诱饵。
A fishing line, bait, or lure used to fish in these ways.
According to Scandinavian folklore, an old troll lived in the mountain cave and guarded the silver mine.
据北欧传说，一个年老的巨怪住在这个山洞里，守护着银矿。
The children drew pictures of huge trolls with long noses and wild hair.
孩子们画了长着长鼻子和乱蓬蓬头发的巨怪。
In the old tale, the princess escaped from the troll by hiding in a hollow tree.
在这个古老的故事里，公主躲进一棵空心的树里，从而逃脱了巨怪。
troll for 表示“以曳绳拖钓”；此时 troll 为不及物动词，后接介词 for 再接目标鱼种。
The fishermen trolled for salmon all morning.
渔夫们整个上午都在用拖钓法钓鲑鱼。
troll 也可作及物动词，宾语常为水域（如 the lake、the river），表示在该水域拖钓。
They trolled the lake for trout.
他们用拖钓法在湖里钓鳟鱼。
troll 作名词指北欧传说中的巨怪或山怪，是可数名词，复数加 -s。
In the old story, there are trolls in the mountains.
在那个古老的故事里，山里有巨怪。
Not this
We trolled along the beach and watched the sunset.
Use this
We strolled along the beach and watched the sunset.
troll 与 stroll 拼写相近，但 troll 作动词时指“曳绳钓鱼”“轮唱”或“使转动”，并无“散步”之意；表示悠闲散步应用 stroll。将 trolled 改为 strolled 后，句子才能正确表达“沿着海滩散步”这一含义。
Not this
The fishermen trolled the lake with a net to catch sardines.
Use this
The fishermen trawled the lake with a net to catch sardines.
troll 作动词时指用拖曳钓线（带饵或拟饵）的方式钓鱼，而用网在水中拖捕鱼虾应用 trawl。将 trolled 改为 trawled 后，才能准确表达“用拖网捕鱼”的动作，避免与“曳绳钓”混淆。
Not this
The cave is full of troll.
Use this
The cave is full of trolls.
troll 表示“巨怪”时是可数名词，复数形式为 trolls。汉语没有名词单复数变化，学习者容易漏加 -s；加上复数词尾后，句子才符合英语主谓一致和名词数的规则。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
山怪；山中巨怪
The legend describes a mountain troll that guards the pass.
传说描述了一个守在山口的山怪。
拖钓（某种鱼）
They trolled for salmon in the fjord.
他们在峡湾里拖钓鲑鱼。
去拖钓
We went trolling behind the island.
我们在岛后去拖钓了。
拖钓拟饵
A shiny trolling lure attracts game fish.
闪亮的拖钓拟饵能吸引游钓鱼。
拖钓钓线
He let out a long trolling line behind the boat.
他在船后放出了一条长拖钓钓线。
（像拖钓一样）搜寻，试探性地寻求
He's always trolling for compliments.
他总是在试探性地博取恭维。
Use troll naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：北欧巨怪troll住山洞，拖钓时曳绳转动——怪与钓法同词。
语域：neutral 常见场景：fantasy fiction、folklore studies、role-playing games 这里指北欧传说或民间传说中的巨怪/山怪，多出现在奇幻文学、民间传说讨论和角色扮演游戏等语境。该词在这一义项下通常属于中性词，正式或非正式场合都能使用，没有明显的语域限制。
动词的过去式和过去分词均为 trolled，现在分词为 trolling。第三人称单数与名词复数同为 trolls。
Dictionary facts from ECDICT, WIKTIONARY.