quake in one's boots
to be afraid, to shake from fear
I was quaking in my boots when my boss told me to come to his office.
Rules to play Skeet Shooting
Side by side
Like the over and under, there are two barrels, however instead of being arranged in a vertical stack they are next to each other on a horizontal plane. Sidebysides are harder to aim for new shooters, as the two barrels does not provide the same instinctive feedback as the single visible barrel of a semiautomatic or O/U. Modern production of SXS weapons is limited, in favor of O/U, and older weapons are usually not rated for steel shot, preventing their use on many shooting ranges.