She gasped, her knees almost collapsing at the rush of unexpected pleasure.

And a knee in his chin as he collapsed.

I sprang up, hurling myself against their arms; fell back as my knee collapsed.

I shot him three times before his knees collapsed from under him.

My stomach was hurting and I felt like my knees would collapse.

He was on a jog eight years ago when his knee collapsed.

He felt each one as a blow, and his knees collapsed, first the right and then the left, beneath him.

Emma's knees collapsed, and she sat on the bed.

Qwilleran sat down as if his knees had collapsed.

His knees collapsed, and he began to slump to the ground.