QUAKE

(SHAKE) [verb] [I] - to shake because you are very frightened or very amused, or to feel or show great fearEvery time I get on a plane, I quake with fear.She quaked at the prospect of having to tell him what she'd done.Charlie stood outside the head teacher's office, quaking in his boots/shoes (= feeling very frightened).The play was so funny, we were all quaking with laughter.