an increase in width
"The widening of the road will soon allow two lanes of traffic to pass each other safely."
the act of making something wider
"The construction crew spent all morning widening the alleyway to allow emergency vehicles through."
The action of the verb widen.
"The widening gap between our schedules made it impossible for us to meet up this week."
present participle of widen
"The widening gap between their opinions made it impossible to reach an agreement."
Growing wider or farther apart.
"As the river swelled after the storm, its banks began to show signs of erosion from the widening flow."