flounder

/ˈflaʊndər/ verb [I]

Definition

MOVEMENT › to make wild movements with your arms or body, especially because you are trying not to sink

NOT KNOW › to not know what to do or say: When he resigned, the team was left floundering.

FAIL › If a relationship, organization, or plan flounders, it fails or begins to experience problems: By 1993 his marriage was floundering.

(Definition of flounder verb from the Cambridge Learner's Dictionary © Cambridge University Press)

If a reason, argument or explanation holds water, it is true

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