knock ***
strike hard

Then the other stone struck hard into the right eye.

That is precisely the reason why we must strike hard now.

He had struck hard against a metal edge in his fall.

Stone felt as if he'd been struck hard in the chest.

She committed herself to the opinion that now was the time to strike hard.

His fingers struck hard into the page to emphasize certain words.

The beak struck hard on the top of her head.

He rubbed his shoulder as if he'd been struck hard by something.

It is better to strike hard than to mourn long!

When the loneliness struck at her so hard, prayer did no good.

It did not strike very hard but must have shot some poison into his brain.

We need to strike hard and quickly just now, to make an impression.

It would stay a dream now, unless he struck hard and soon.

I say we strike hard and have done with them.

It struck so hard that the shock kept him from feeling any pain for a moment.

Mr. Yeltsin, appearing on television about a half hour later, struck hard and straight.

He struck hard and often, never knowing for or against which side he was fighting.

He struck so hard that he raised the man clear off his feet.

Her other knee struck so hard that she felt it in her shoulder.

We'll strike so hard and deep into forbidden space they'll think the damage they did here was a slap on the wrist.