Student or Learner
"Several studies have dashed this hypothesis" ?
What does "to dash" in this sentence mean? Can you replace it by another verb???
dashed= smashed, discredited, ruined
To dash can mean to strike (something) violently against (something else):
She dashed the mirror to pieces against the wall.
It is also used figuratively:
Her poor performance on the exam dashed her hopes of entering the program;
or, as in your example, where the validity of the hypothesis was ruined by the results of the several studies.
all best wishes,