a situation that could suddenly become extremely dangerous.

We left just before the revolution, realizing that we were sitting on a powder keg.

• in face
• in fact
• in favor of
• in favor of something
• in fits and starts
• in flagrante
• in flagrante delicto
• In for a penny.
• In for a penny, in for a pound.
• in force
• in for the kill
• in front of
• in front of someone
• in full force
• in full swing
• in fun
• in gear
• in general
• in glory
• in good company
• in good conscience
• in good faith
• in good graces
• in good hands
• in good time