Answer:
to do something without believing it is important: After his wife died, he went through the motions of living without really feeling anything.
The technique that this sentence best illustrates is understatement.
Understatement means that you are not showing the full 'strength' of something, but it is rather understated - so here, the coach only said that 'he was glad' even though his team won the Super Bowl, which is a huge deal. So his emotions should have been way stronger.
I think the answer is a hyperbole because it doesnt have any like or as
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