To fall in
To give in from or as if from a gradual loss of strength
To devote (oneself or one's efforts)
As he slid away, his belt buckle gouged into her stomach and she cried out in pain.
The large belt buckle at his lean waist lay flat against a washboard stomach.
Her gaze continued up to the large western belt buckle that hugged his flat abdomen.
Where the central oceanic buckle attains the water-line we have our oceanic islands, seen in our type ocean, as St Helena and the Azores.