noun
A point at which something comes to an end abruptly or forcefully
adjective
Difficult or requiring a great deal of effort
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The meeting has a hard stop at 4:00 PM, so please make sure to wrap up discussions on time.
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We need to finish the project by Friday, it's a hard stop.
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If we don't leave now, we'll miss the movie - it's a hard stop.
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His dedication to his work is a hard stop for anyone trying to match his level of commitment.