= state in which an object is not firmly fixed to the surface on which it stands so that it can move or slip; to waver

literally: (one's) hand wavers; hence: = state in which humans are unable to provide for themselves

= state in which a condition that has been in place for a considerable amount of time is about to come to an end

literally: to be shaken; hence: = state in which humans are affected by difficult circumstances and feel worried and concerned

= process by which objects fall down

literally: to cause to fall down; hence: = causative process by which humans cause events to happen to other humans