sinker

名词 sinker:

1. a small ring-shaped friedcake
   同义词：doughnut, donut
2. a weight that sinks (as to hold nets or fishing lines under water)
3. a pitch that curves downward rapidly as it approaches the plate

1. John was so easily fooled that he fell for Joe's story hook, line and sinker.
   约翰是那么容易受骗，竟毫不怀疑地相信乔的话。
2. What I said was untrue but he fell for it/swallowed it(ie believed it) hook, line and sinker.
   我所说的并非实话，他却完全信以为真。