It becomes cold at a stretch

collapse at a stretch
一気に崩れる［つぶれる・崩壊する・倒壊する］

It becomes cold at a stretch
一気に冷え込む［寒くなる］。

clear the debt overhang at a stretch
過剰債務を一気に片付ける

drink contents of the glass at a stretch
グラスの中身を一気［一息］に飲み干す

on the phone for 1 hours at a stretch
《be ～》立て続けに1時間電話で話している

We finished this difficult job at full stretch and were praised for it.
私たちはその困難な仕事を完全にやり遂げて、賞賛を浴びた。