To look after- to take care. In absence of the principal, vice-principal looks after the college.
To get hold of- capture. The dacoit got hold of my brother for money.
Accumulate - to collect. The health officer accumulated great wealth within no time.
Pounce - to attack rapidly. The eagle pounced upon the dove suddenly.
Knelt down - sat down upon knees. Ramesh knelt down for prayer in the temple.