Definition of catch a crab in English:

catch a crab

Rowing Make a faulty stroke in which the oar is under water too long or misses the water altogether.
More example sentences
  • Just strokes before the line, Great Britain's second crew caught a crab which slowed them down to a crawl.
  • With less than 100 metres to go Great Britain had a slight lead in the first of two repechages when bow, Alison Mowbray, caught a crab.
  • In a very unusual display at this level of rowing, Kucharski caught a crab with 200 metres to go pushing them further back.
See parent entry: crab

Definition of catch a crab in:

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Word of the day retroflex
Pronunciation: ˈretrəˌfleks
turned backward