straw that breaks the camel's back

The al Qaeda-linked gunmen shot back, but only managed to injure one officer before they were taken out.

I waited three months more, in great impatience, then sent him back to the same post, to see if there might be a reply.

Ages back—let musty geologists tell us how long ago—'twas a lake, larger than the Lake of Geneva.

The boys were tumbling about, clinging to his legs, imploring that numerous things be brought back to them.

With a suffocating gasp, she fell back into the chair on which she sat, and covered her face with her hands.

She was holding the back of her chair with one hand; her loose sleeve had slipped almost to the shoulder of her uplifted arm.